Microsoft will end their support for Microsoft 365 Apps and Teams support on Windows Server 2022 ends on 13 October 2026. This marks a significant change in how that product is serviced and protected. During mainstream support, organisations benefit from feature updates, security patches and full technical assistance. Once a product moves beyond this phase, only limited security updates may continue under extended support. When support ends completely, there are no further security fixes, bug resolutions or technical guidance. 

For businesses running Microsoft 365 Apps and Teams on Windows Server 2022, this means increased security, compliance and operational risk if action is not taken in time. 

Why 13 October 2026 Matters 

13 October 2026 has now become a critical date for organisations using Microsoft 365 Apps and Microsoft Teams on Windows Server 2022. Under Microsoft’s Fixed Lifecycle Policy, Windows Server 2022 reaches the end of mainstream support on this date. While extended support continues until 2031, it is limited to security updates only. 

Microsoft 365 Apps operate under the Modern Lifecycle Policy, which requires the underlying operating system to remain fully supported. As a result, support for Microsoft 365 Apps and Teams on Windows Server 2022 ends when mainstream support ends in October 2026. 

In practical terms: 

• Windows Server 2022 was released in August 2021 
• Mainstream support ends on 13 October 2026 
• Extended support runs until 2031 (security updates only) 
• Microsoft 365 Apps and Teams support on this platform ends in October 2026 

After this point, organisations will no longer receive feature updates, compatibility fixes or full technical support for Microsoft 365 Apps and Teams on Windows Server 2022. Planning ahead ensures continuity, security and long-term stability. 

Affects to Microsoft Teams  

Microsoft Teams running on Windows Server 2022 will also fall outside Microsoft’s supported configuration after October 2026. Although Teams may continue to operate initially, Microsoft will not provide assistance for performance issues, integration challenges or compatibility problems specific to that environment. 

As Teams continues to evolve, new features and service updates are designed for supported operating systems. Over time, this can lead to degraded functionality, failed integrations and an inconsistent user experience. Running Teams in an unsupported state introduces avoidable operational risk. 

Migration Paths and Alternatives 

Microsoft’s long-term strategy centres on secure, supported client and cloud environments. Rather than continuing to host Microsoft 365 Apps and Teams directly on Windows Server, organisations should consider modern alternatives. 

Recommended options include: 

• Azure Virtual Desktop (AVD) – A scalable, cloud-based virtual desktop solution delivering Microsoft 365 Apps in a fully supported configuration. 
• Windows 365 Cloud PC – A fully managed desktop experience streamed securely from the cloud, simplifying infrastructure and reducing management overhead. 

These platforms provide performance, security and compliance assurance while aligning with Microsoft’s supported architecture for Microsoft 365. 

At Enterprise Solutions, we help organisations assess the right path forward based on infrastructure, licensing, security requirements and long-term strategy. 

Prepare for a Smooth Transition 

A structured migration plan reduces risk and ensures business continuity. Key steps include: 

• Auditing where Microsoft 365 Apps and Teams are deployed on Windows Server 2022 
• Reviewing licensing, infrastructure capacity and network readiness 
• Testing compatibility with line-of-business applications 
• Validating identity, security and access configurations 
• Running pilot deployments before full rollout 

Organisations need to understand that tasks that are required to migrate to a modern OS, may need more time than initially expected, due to potential complexities and time requirements of migrating legacy apps to a modern OS. Early planning for this will avoid last-minute disruption and provides confidence that your environment remains secure and fully supported. 

What Happens If You Don’t Migrate

Continuing to run Microsoft 365 Apps and Teams on Windows Server 2022 after October 2026 places the organisation in an unsupported position. 

This may result in:

• No entitlement to Microsoft technical support 
• No compatibility fixes for future Microsoft 365 updates 
• Potential feature or performance issues 
• Increased security and compliance exposure 
• Ultimately, the responsibility and risk sit entirely with the organisation. 

At Enterprise Solutions, we approach lifecycle transitions with clarity, structure and proven expertise. The 13th October 2026 deadline is not just a technical milestone it is an opportunity to modernise, strengthen security and future-proof your Microsoft 365 environment with confidence.

Ref links

• https://learn.microsoft.com/en-us/lifecycle/products/windows-server-2022
• https://learn.microsoft.com/en-us/microsoftteams/teams-client-vdi-requirements-deploy
• https://learn.microsoft.com/en-us/microsoft-365-apps/end-of-support/windows-server-migration