Microsoft Azure History and Timeline - Major Milestones from Windows Azure to the Present
First Published:
Last Updated:
The question "when did Azure ship X?" is asked constantly by developers, architects, and learners, yet the answer is usually scattered across a decade of separate Microsoft blogs whose URLs have moved more than once. This article organizes those platform-level milestones in one place, in ascending order, each with the Microsoft-official source that records it. If you follow my AWS and foundation-model timelines, this is intended as a multi-cloud companion rather than a comparison; it is a vendor-neutral record of what Microsoft shipped and when.
This article focuses on platform-level milestones - announcements, general-availability dates, renames, and infrastructure turning points. It is not a pricing guide, a market analysis, or an exhaustive catalog of every Azure service; it is a curated chronology of the changes that shaped the platform.
Companion articles on hidekazu-konishi.com:
- AWS History and Timeline - Almost All AWS Services List, Announcements, General Availability(GA)
- AWS History and Timeline regarding AWS Global Infrastructure - Regions, Availability Zones, Summary of Expansions, and Introduction
- Anthropic Claude Model Release Timeline - Model Family Tree, Capability Evolution, and Platform Availability
- OpenAI GPT Model Release Timeline - Model Lineage, ChatGPT and Codex Milestones, and Platform Availability
Background and Method of Creating the Microsoft Azure Timeline
The reason for creating this timeline is that Microsoft Azure has evolved over more than fifteen years, across many product names and organizational changes, and the primary facts are spread across a long trail of Microsoft blogs, news posts, and documentation - many of which have been renamed or relocated. It is genuinely difficult to keep a mental map of "when did Windows Azure become generally available?", "when exactly was it renamed to Microsoft Azure?", and "when did Azure OpenAI Service move from invitation-only to preview to general availability?". I wanted one page that organizes these facts chronologically, with a primary source for each one.To organize this history, I have taken the following approaches.
- Tracking the history of Microsoft Azure and organizing the transition of updates.
- Summarizing the current overall picture of the Azure platform's major service families.
- Platform turning points - the original announcement, commercial general availability, and major rebrands.
- The first general availability of a service family that defines the platform (for example infrastructure VMs, App Service, Azure Functions, AKS, Cosmos DB, Synapse, Azure Arc, Azure OpenAI Service, Microsoft Fabric, and Azure AI Foundry).
- Renames, because Azure's naming history is unusually significant (Windows Azure to Microsoft Azure; Azure Active Directory to Microsoft Entra ID; Azure AI Studio to Azure AI Foundry to Microsoft Foundry).
- Representative datacenter-geography and infrastructure milestones, including Microsoft's custom Azure silicon (Maia and Cobalt).
- Announcements and general availability are recorded as separate rows when both are notable, so that "announced/preview" and "generally available" are never conflated.
The source policy is primary-only. Dates come from Microsoft's own announcements and documentation, and secondary media are not used as the source of record. For the 2012-2013 period, several Windows Azure general-availability posts were published on Scott Guthrie's blog at weblogs.asp.net/scottgu; at the time, Scott Guthrie was the Corporate Vice President responsible for Windows Azure, and that blog was Microsoft's de facto official announcement channel before azure.microsoft.com/blog consolidated it, so those posts are cited as the primary record for that era. Where a Microsoft source states only a month, the timeline reflects that precision rather than inventing a specific day. This is a vendor-neutral record: it states what each release was, without ranking Azure against any other cloud.
This timeline primarily references the following sources.
- Microsoft Azure Blog
- The Official Microsoft Blog
- Microsoft News
- Microsoft Learn Azure documentation
- Microsoft Community Hub (Tech Community)
The content posted here is limited to the milestones considered essential for understanding the history of Microsoft Azure.
In other words, please note that the items on this timeline are not all updates to Azure, but are representative milestones that I have picked out.
Microsoft Azure Historical Timeline (Updates from October 27, 2008)
Here is the chronological timeline of the major milestones of Microsoft Azure, from the unveiling of Windows Azure in 2008 through the AI era of the mid-2020s. Each row links to the official announcement, news release, or documentation.* You can sort the table by clicking on the column name.
2008 | 2009 | 2010 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026
| Date | Event |
|---|---|
| 2008-10-27 | Microsoft unveils Windows Azure at the Professional Developers Conference (PDC). Presented by Ray Ozzie as part of the Azure Services Platform, Windows Azure was described as a cloud operating system hosted in Microsoft datacenters, with a limited Community Technology Preview (CTP) offered to attendees. Source: Microsoft unveils Windows Azure at PDC. |
| 2009-11-17 | Microsoft formally launches the Windows Azure platform at PDC 2009. The launch brought together Windows Azure with SQL Azure (the renamed SQL Data Services) and the Windows Azure platform AppFabric (Service Bus and Access Control), ahead of commercial availability. Source: Microsoft cloud services vision becomes reality with launch of the Windows Azure platform. |
| 2010-02-01 | Windows Azure and SQL Azure reach commercial general availability. Billing began for the platform-as-a-service offering across 21 countries, with the original pillars of Compute (web and worker roles), Storage (Blobs), SQL Azure, and Service Bus. Source: Windows Azure general availability. |
| 2012-06-07 | "Meet the new Windows Azure" introduces Infrastructure-as-a-Service in preview. A major update delivered a new HTML5 management portal and previews of Windows Azure Virtual Machines (durable IaaS), Windows Azure Web Sites, Virtual Network, and Media Services. Source: Meet the New Windows Azure. |
| 2012-08-28 | Windows Azure Mobile Services enters public preview. Mobile Services provided a managed backend (data, authentication, and push notifications) for mobile apps - the precursor to Azure Mobile Apps. Source: Announcing Windows Azure Mobile Services. |
| 2013-04-08 | Windows Azure Active Directory reaches general availability. The cloud directory service reached GA with production support for SAML 2.0 single sign-on and the Azure AD Graph REST API - the identity foundation later renamed Microsoft Entra ID. Source: Windows Azure Active Directory general availability. |
| 2013-04-16 | Windows Azure Infrastructure-as-a-Service (Virtual Machines and Virtual Networks) reaches general availability. IaaS reached GA with an enterprise SLA and a gallery of Windows and Linux images (including Ubuntu, CentOS, and SUSE), moving Azure beyond pure PaaS. Source: Windows Azure general availability of Infrastructure as a Service (IaaS). |
| 2013-06-27 | Windows Azure Web Sites reaches general availability. The managed web-hosting service exited preview with a 99.9% SLA and a Standard tier offering dedicated instances - the service later renamed Azure App Service. Source: Windows Azure general availability release of Web Sites and Mobile Services. |
| 2013-10-28 | Windows Azure HDInsight reaches general availability. HDInsight delivered Apache Hadoop as a managed service, built in collaboration with Hortonworks, marking Azure's entry into managed big-data analytics. Source: Announcing Windows Azure HDInsight: Where big data meets the cloud. |
| 2013-11-21 | Windows Azure Traffic Manager reaches general availability. DNS-based global traffic routing and failover reached GA with a 99.99% SLA, announced alongside the GA of BizTalk Services and the preview of Azure Active Directory Premium. Source: Windows Azure general availability release of BizTalk Services, Traffic Manager, and Azure AD App Access. |
| 2014-03-25 | Microsoft announces that Windows Azure will be renamed Microsoft Azure. The rename, reflecting that the platform had grown well beyond Windows to embrace Linux and open-source workloads, was announced on March 25 and took effect on April 3, 2014, during Build 2014. Source: Upcoming name change for Windows Azure. |
| 2014-06-16 | Microsoft announces Azure Machine Learning. Azure Machine Learning brought a cloud-based, drag-and-drop environment for building and deploying predictive models, with a public preview to follow in July 2014. Source: Microsoft Azure Machine Learning combines power of comprehensive machine learning with benefits of cloud. |
| 2015-02-18 | Azure Machine Learning reaches general availability. Announced at Strata + Hadoop World, Azure ML reached GA as a fully managed service for building, deploying, and operating machine-learning models. Source: New Azure services help people realize the possibilities of big data. |
| 2015-03-24 | Azure App Service launches, with Web Apps generally available. App Service unified Azure Websites, Mobile Services, and BizTalk Services into a single platform with Web Apps (GA) and Mobile, Logic, and API Apps, providing an integrated application-hosting model. Source: Announcing Azure App Service. |
| 2015-09-29 | Microsoft Azure becomes generally available from datacenters in India. Azure went live from local Indian regions (Central, South, and West India), an example of the platform's ongoing global datacenter expansion. Source: Microsoft opens local datacenters in India. |
| 2015-12-02 | Azure Container Service (ACS) enters preview. ACS provided a way to create and manage a cluster of hosts running Docker containers, orchestrated with Apache Mesos or Docker Swarm - Azure's first managed container offering. Source: Azure Container Service preview. |
| 2015-12-02 | The Azure Resource Manager portal reaches general availability. The new portal (portal.azure.com, codenamed "Ibiza"), first previewed at Build 2014 together with Azure Resource Manager (ARM) and its declarative deployment model, reached GA and became the default Azure portal. Source: Announcing Azure portal general availability. |
| 2016-03-31 | Azure Service Fabric reaches general availability. Announced at Build 2016, Service Fabric - the microservices platform underpinning many Microsoft services - reached GA for Windows, with Linux support in preview. Source: Azure Service Fabric is GA. |
| 2016-03-31 | Microsoft introduces Azure Functions in preview. Azure Functions brought event-driven, serverless compute to Azure, letting developers run code on demand without managing infrastructure. Source: Introducing Azure Functions. |
| 2016-09-07 | Microsoft Azure becomes generally available from UK datacenters. Azure went live from multiple UK regions, continuing the platform's regional expansion for data-residency-sensitive customers. Source: Microsoft Azure now available from UK datacenters. |
| 2016-11-15 | Azure Functions reaches general availability. Serverless Functions reached GA across multiple Azure regions, establishing Azure's function-as-a-service programming model. Source: Announcing general availability of Azure Functions. |
| 2017-05-10 | Azure Cosmos DB reaches general availability. Announced at Build 2017 as the evolution of Azure DocumentDB, Cosmos DB is a globally distributed, multi-model database with multiple consistency levels and several data-model APIs. Source: Azure Cosmos DB: Microsoft's globally distributed, multi-model database service. |
| 2017-07-10 | Microsoft Azure Stack becomes available to order. Azure Stack extended Azure services to customers' own datacenters, reaching general availability as software delivered on integrated systems from hardware partners. Source: Microsoft Azure Stack is ready to order now. |
| 2017-09-25 | Microsoft introduces Azure Availability Zones in preview. Availability Zones brought physically separate, independently powered datacenter locations within a region, launching first in East US 2 and West Europe for higher-resiliency architectures. Source: Introducing Azure Availability Zones for resiliency and high availability. |
| 2017-10-24 | Microsoft introduces Azure Kubernetes Service (AKS) in preview. AKS provided a managed Kubernetes offering, split out from the multi-orchestrator Azure Container Service, and quickly became Azure's primary container-orchestration service. Source: Introducing AKS (managed Kubernetes) and Azure Container Registry geo-replication. |
| 2018-06-13 | Azure Kubernetes Service (AKS) reaches general availability. AKS reached GA and expanded across multiple regions, offering a managed Kubernetes control plane and a simplified operational experience for containerized workloads. Source: Azure Kubernetes Service (AKS) GA - new regions, new features, new productivity. |
| 2019-03-06 | Microsoft Azure becomes generally available from datacenters in Africa. Azure went live from new regions in South Africa (Cape Town and Johannesburg), Microsoft's first datacenters on the African continent. Source: Microsoft opens its first datacenters in Africa with the general availability of Microsoft Azure. |
| 2019-11-04 | Microsoft announces Azure Arc at Ignite 2019. Azure Arc extended Azure management and governance to servers, Kubernetes clusters, and data services running on any infrastructure - on-premises, at the edge, or in other clouds - entering preview. Source: Azure services now run anywhere with new hybrid capabilities: announcing Azure Arc. |
| 2019-11-04 | Microsoft announces Azure Synapse Analytics at Ignite 2019. Positioned as the next evolution of Azure SQL Data Warehouse, Synapse unified enterprise data warehousing and big-data analytics into a single service, entering preview. Source: Simply unmatched, truly limitless: announcing Azure Synapse Analytics. |
| 2020-04-27 | Azure confidential computing DCsv2-series VMs reach general availability. Backed by Intel SGX hardware, the DCsv2-series brought a trusted execution environment that protects data while it is in use, reaching GA in an initial set of regions. Source: DCsv2-series VM now generally available from Azure confidential computing. |
| 2020-12-03 | Azure Synapse Analytics reaches general availability. Synapse reached GA, unifying data integration, enterprise data warehousing, and big-data analytics with a single workspace and studio experience. Source: Harness analytical and predictive power with Azure Synapse Analytics. |
| 2020-12-10 | Azure Stack HCI reaches general availability. The subscription-based hyperconverged-infrastructure service reached GA, letting customers run virtualized Windows and Linux workloads on-premises with a consistent connection to Azure. Source: Starting a new era for Azure Stack HCI. |
| 2021-03-02 | Azure Arc-enabled Kubernetes reaches general availability. Arc-enabled Kubernetes reached GA with GitOps-based configuration and Azure Policy integration, extending consistent management to Kubernetes clusters anywhere as Azure Arc's hybrid capabilities expanded. Source: Azure Arc-enabled Kubernetes is now generally available. |
| 2021-11-02 | Microsoft announces Azure OpenAI Service at Ignite 2021. Azure OpenAI Service brought OpenAI's models (initially GPT-3) to Azure with enterprise security and compliance, available by invitation only at announcement. Source: Microsoft Ignite November 2021 Book of News. |
| 2022-05-24 | Azure OpenAI Service moves to limited-access preview. At Build 2022, Azure OpenAI Service expanded to a limited-access preview, adding GPT-3, Codex, and embeddings models along with fine-tuning capabilities. Source: Azure OpenAI Service helps customers accelerate innovation with large AI models. |
| 2022-05-24 | Azure Container Apps reaches general availability. Container Apps reached GA as a fully managed serverless container service built on Kubernetes, KEDA, Dapr, and Envoy, for running microservices and event-driven workloads without managing the cluster. Source: Azure Container Apps: general availability. |
| 2022-05-31 | Microsoft announces the Microsoft Entra product family. Microsoft Entra was introduced as an umbrella identity and access brand encompassing Azure Active Directory alongside new categories such as permissions management and verifiable credentials - the branding that Azure AD would later fold into. Source: Secure access for a connected world - meet Microsoft Entra. |
| 2023-01-17 | Azure OpenAI Service reaches general availability. Azure OpenAI Service reached GA, providing access to models including GPT-3.5, Codex, and DALL-E 2 with Azure's enterprise-grade security, compliance, and regional availability. Source: General availability of Azure OpenAI Service. |
| 2023-03-21 | GPT-4 becomes available in preview in Azure OpenAI Service. Azure OpenAI Service added preview access to GPT-4, bringing OpenAI's then-newest multimodal-capable model to Azure customers. Source: Introducing GPT-4 in Azure OpenAI Service. |
| 2023-05-23 | Microsoft announces Microsoft Fabric in preview at Build 2023. Fabric unified data engineering, data integration, data warehousing, real-time analytics, and Power BI into a single SaaS analytics platform built on a shared data lake (OneLake), entering public preview. Source: Introducing Microsoft Fabric: Data analytics for the era of AI. |
| 2023-05-23 | Microsoft announces Azure AI Studio in preview at Build 2023. Azure AI Studio was introduced as a tool for grounding models such as GPT-4 on an organization's own data and building copilots, entering preview. Source: Microsoft Build brings AI tools to the forefront for developers. |
| 2023-07-11 | Microsoft announces the rename of Azure Active Directory to Microsoft Entra ID. Azure AD was folded into the Microsoft Entra family and renamed Microsoft Entra ID, with capabilities and licensing unchanged; the product-experience rollout followed in stages later in 2023. Source: Microsoft Entra expands into security service edge and Azure AD becomes Microsoft Entra ID. |
| 2023-11-15 | Microsoft Fabric reaches general availability. Announced at Ignite 2023, Fabric reached GA as Microsoft's unified analytics platform for the era of AI. Source: Microsoft Fabric is now generally available. |
| 2023-11-15 | Microsoft unveils its first custom Azure silicon: Maia 100 and Cobalt 100. At Ignite 2023, Microsoft announced the Azure Maia 100 AI accelerator and the Azure Cobalt 100 Arm-based CPU, its first purpose-built chips for AI and general-purpose cloud workloads. Source: Microsoft Azure delivers purpose-built cloud infrastructure in the era of AI. |
| 2024-04-23 | Microsoft introduces the Phi-3 small language models on Azure AI. The Phi-3 family of small language models (starting with Phi-3-mini) became available on Azure AI, extending Azure's first-party model lineup beyond large models. Source: Introducing Phi-3: Redefining what's possible with SLMs. |
| 2024-05-21 | Azure AI Studio reaches general availability. At Build 2024, Azure AI Studio reached GA as an end-to-end platform for building, evaluating, and deploying generative-AI applications responsibly. Source: Developing and deploying generative AI apps responsibly with Azure AI Studio. |
| 2024-11-19 | Microsoft announces Azure AI Foundry at Ignite 2024. Azure AI Foundry consolidated Microsoft's AI development stack: Azure AI Studio was renamed the Azure AI Foundry portal, a new Foundry SDK was introduced, and the Azure AI Agent Service launched in preview. Source: The next wave of Azure innovation: Azure AI Foundry, intelligent data, and more. |
| 2024-11-19 | Microsoft renames Azure Stack HCI to Azure Local at Ignite 2024. The rename brings its distributed infrastructure offering under a single brand, with existing clusters renamed as Azure Local instances. Source: Renaming Azure Stack HCI to Azure Local. |
| 2025-05-19 | Azure AI Foundry Agent Service reaches general availability. At Build 2025, the Azure AI Foundry Agent Service reached GA, providing a managed service for building, deploying, and operating AI agents. Source: Announcing general availability of Azure AI Foundry Agent Service. |
| 2025-09-18 | Microsoft unveils Fairwater, a purpose-built AI datacenter in Wisconsin. Microsoft introduced the Fairwater site, describing it as the world's most powerful AI datacenter — a purpose-built Azure campus for training frontier AI models, and a representative milestone in Azure's AI-infrastructure build-out alongside its custom silicon. Source: Inside the world's most powerful AI datacenter. |
| 2025-11-12 | Microsoft unveils its next Fairwater site in Atlanta and the Azure "AI superfactory." The new Fairwater datacenter in Atlanta, Georgia was announced as part of a design that links Fairwater sites and earlier AI supercomputers into what Microsoft calls an AI superfactory for frontier AI workloads. Source: Infinite scale: The architecture behind the Azure AI superfactory. |
| 2025-11-18 | Microsoft rebrands Azure AI Foundry as Microsoft Foundry at Ignite 2025. Azure AI Foundry was renamed Microsoft Foundry and positioned as a peer platform alongside Microsoft 365 and Microsoft Fabric, with its model catalog expanded to include Anthropic's Claude and Cohere models. Source: Accelerating enterprise AI with Microsoft Foundry. |
| 2025-11-18 | Microsoft announces the Azure Cobalt 200 CPU in preview at Ignite 2025. Cobalt 200, a next-generation Arm-based CPU for Azure, was announced in preview, continuing Microsoft's custom-silicon strategy for general-purpose cloud workloads. Source: Announcing Cobalt 200: Azure's next cloud-native CPU. |
| 2026-01-26 | Microsoft introduces the Azure Maia 200 AI inference accelerator. Maia 200, a next-generation AI inference accelerator, was introduced with initial deployment beginning in US Azure regions, extending Microsoft's silicon-to-service strategy for AI workloads. Source: Microsoft introduces Maia 200, a new inference accelerator for Azure. |
| 2026-06-02 | Azure HorizonDB enters public preview at Build 2026. Azure HorizonDB, a fully managed PostgreSQL-compatible database designed for AI applications — with vector search, integrated AI model management, and direct connectivity to Microsoft Foundry and Fabric — became available in public preview. Source: Microsoft Build 2026: Building agentic apps with Microsoft Fabric and Microsoft Databases. |
There may be slight variations in the dates in this timeline due to differences between announcement, preview, general availability, and product renames. The dates above prioritize the original announcement date when more than one exists.
Current Overview of Microsoft Azure
Having followed the chronology, this section summarizes the current overall picture of the Azure platform - the major service families that the timeline above led to. It is a map of the platform's structure, not a deep dive into any one service.Azure's history falls into four broad eras, which is a useful way to hold the whole platform in mind.
- Windows Azure era (2008-2014) - a platform-as-a-service cloud, from the PDC 2008 unveiling to commercial GA in 2010 and the arrival of infrastructure VMs in 2013.
- Microsoft Azure and the open cloud (2014-2018) - the rename to Microsoft Azure, the Azure Resource Manager deployment model, and a broadening embrace of Linux, open source, App Service, serverless Functions, and managed Kubernetes.
- Hybrid and cloud maturity (2018-2022) - global datacenter expansion, Azure Arc for hybrid and multicloud management, Synapse for analytics, and confidential computing.
- AI era (2023-present) - Azure OpenAI Service, Microsoft Fabric, custom Azure silicon (Maia and Cobalt), and the Azure AI Foundry / Microsoft Foundry platform for building AI applications and agents.
Major Azure Service Families
The current platform is best understood as a set of service families rather than a flat list of services.- Compute - Azure Virtual Machines and Virtual Machine Scale Sets for IaaS; Azure App Service for web and API hosting; Azure Functions for serverless event-driven compute; Azure Container Apps, Azure Kubernetes Service (AKS), and Service Fabric for containers and microservices.
- Storage - Azure Blob Storage for objects, Azure Files for managed file shares, and Azure Managed Disks for VM block storage.
- Networking - Azure Virtual Network, Load Balancer, Application Gateway, Azure Front Door, Traffic Manager, and Virtual WAN for connectivity, global routing, and edge delivery.
- Databases - Azure SQL Database and SQL Managed Instance, Azure Cosmos DB for globally distributed multi-model data, and managed Azure Database for PostgreSQL and MySQL.
- Analytics and data - Microsoft Fabric as the unified SaaS analytics platform, alongside Azure Synapse Analytics, Azure Databricks, Data Factory, and HDInsight.
- AI - Microsoft Foundry (formerly Azure AI Foundry, itself formerly Azure AI Studio) is the platform for building AI applications and agents. It includes the Foundry model catalog - Azure OpenAI models (such as the GPT family, including GPT-4o), Microsoft's own Phi small language models, and third-party models added over time such as Anthropic's Claude and Cohere - together with the Foundry Agent Service for building agents.
- Identity - Microsoft Entra ID (formerly Azure Active Directory) provides identity and access management within the broader Microsoft Entra family.
- Hybrid and multicloud - Azure Arc projects Azure management, governance, and data services onto servers, Kubernetes, and databases running anywhere, while Azure Local (formerly Azure Stack HCI, renamed in 2024) and Azure Stack Edge extend Azure to on-premises and edge locations.
- Infrastructure - a global footprint of regions and Availability Zones, increasingly powered by Microsoft's own Azure silicon: the Cobalt Arm-based CPUs (Cobalt 100, Cobalt 200) and the Maia AI accelerators (Maia 100, Maia 200).
- Management and governance - Azure Resource Manager and the Azure portal provide the deployment and management plane, with Azure Monitor, Azure Policy, and Microsoft Cost Management for operations and governance.
Azure's Naming History at a Glance
Azure's renames are frequent enough to be worth a dedicated reference. The table below consolidates the major ones.| Original name | Current name | Announced |
|---|---|---|
| Windows Azure | Microsoft Azure | 2014-03-25 (effective 2014-04-03) |
| SQL Data Services / SQL Azure | Azure SQL Database | Evolved from 2009 (SQL Azure) onward |
| Azure Websites | Azure App Service | 2015-03-24 |
| Azure DocumentDB | Azure Cosmos DB | 2017-05-10 |
| Azure Active Directory (Azure AD) | Microsoft Entra ID | 2023-07-11 |
| Azure Stack HCI | Azure Local | 2024-11-19 |
| Azure AI Studio | Azure AI Foundry (portal) | 2024-11-19 |
| Azure AI Foundry | Microsoft Foundry | 2025-11-18 |
Frequently Asked Questions about Microsoft Azure History
When was Microsoft Azure launched?
Microsoft first unveiled the platform as "Windows Azure" on 2008-10-27 at the Professional Developers Conference, and it reached commercial general availability on 2010-02-01. It was renamed Microsoft Azure in 2014.When was Windows Azure renamed to Microsoft Azure?
Microsoft announced the rename on 2014-03-25, and it took effect on 2014-04-03, around the Build 2014 conference. The change reflected that the platform had grown well beyond Windows to support Linux and a broad range of open-source workloads.What were the original Windows Azure services?
At its 2010-02-01 commercial general availability, Windows Azure was a platform-as-a-service offering whose core building blocks were Compute (web and worker roles), Storage (Blobs), the SQL Azure relational database, and the Service Bus messaging fabric. Infrastructure-as-a-Service virtual machines did not arrive until 2013.When did Azure OpenAI Service become available?
Microsoft announced Azure OpenAI Service on 2021-11-02 at Ignite 2021 (invitation-only), expanded it to a limited-access preview on 2022-05-24, and made it generally available on 2023-01-17. GPT-4 became available in preview on Azure on 2023-03-21.When was Azure Active Directory renamed to Microsoft Entra ID?
Microsoft announced the rename of Azure Active Directory (Azure AD) to Microsoft Entra ID on 2023-07-11, with capabilities and licensing unchanged. The Microsoft Entra brand family itself had been introduced earlier, on 2022-05-31.What is Microsoft Foundry, and how is it related to Azure AI Studio?
Microsoft Foundry is Microsoft's platform for building AI applications and agents. It is the result of a lineage of renames: Azure AI Studio (announced in preview in 2023, generally available in 2024) was renamed the Azure AI Foundry portal in 2024, and Azure AI Foundry was rebranded Microsoft Foundry at Ignite 2025 on 2025-11-18.When did Azure add infrastructure virtual machines?
Windows Azure Virtual Machines were first shown in preview on 2012-06-07 as part of the "Meet the new Windows Azure" update, and Infrastructure-as-a-Service (Virtual Machines and Virtual Networks) reached general availability on 2013-04-16.Summary
In this article, I created a historical timeline of Microsoft Azure and summarized the current overall picture of its major service families.The timeline shows four phases: the Windows Azure era (2008-2014), which began as a platform-as-a-service cloud and grew to include infrastructure VMs; the open-cloud era (2014-2018), defined by the rename to Microsoft Azure, the Azure Resource Manager model, and an embrace of Linux, containers, and serverless; the hybrid and maturity era (2018-2022), marked by global expansion, Azure Arc, and Synapse; and the AI era (2023-present), shaped by Azure OpenAI Service, Microsoft Fabric, custom Azure silicon, and the Azure AI Foundry / Microsoft Foundry platform. Running through all of it is Azure's habit of renaming - Windows Azure to Microsoft Azure, Azure AD to Microsoft Entra ID, and Azure AI Studio to Azure AI Foundry to Microsoft Foundry - which this timeline records with period-correct names.
By organizing these milestones in one place with a primary source for each, I hope this article serves as a reference that AI search agents, developers, and researchers can consult in a single fetch.
This timeline will be updated as Microsoft Azure continues to evolve.
In addition, there are related history-and-timeline articles on this site, so please have a look if you are interested.
AWS History and Timeline - Almost All AWS Services List, Announcements, General Availability(GA)
AWS History and Timeline regarding AWS Global Infrastructure - Regions, Availability Zones, Summary of Expansions, and Introduction
Anthropic Claude Model Release Timeline - Model Family Tree, Capability Evolution, and Platform Availability
OpenAI GPT Model Release Timeline - Model Lineage, ChatGPT and Codex Milestones, and Platform Availability
References:
Microsoft Azure Blog
The Official Microsoft Blog
Microsoft News
Microsoft Learn - Azure documentation
Microsoft Learn - New name for Azure AD (Microsoft Entra ID)
References:
Tech Blog with curated related content
Written by Hidekazu Konishi