Microsoft’s October 2026 support deadlines put admins on a migration clock

Microsoft has a packed lifecycle calendar in October 2026, with support ending for Office LTSC 2021, mainstream support closing for Windows Server 2022 and Entra ID Sign-In risk policies being retired. For enterprise IT teams, the issue is not a new product launch or a funding event, but a set of operational deadlines that could force migrations across productivity software, identity controls and Windows estates.

The Office LTSC 2021 cutoff covers the suite’s 2021 applications, including Access 2021 and Word 2021. Organizations that want to remain on a supported perpetual Office release will need to move to Office LTSC 2024, while Microsoft continues to position Microsoft 365 as the preferred route for customers willing to use its subscription cloud products.

That choice is not trivial for companies that have kept Office workloads off cloud services for regulatory, architecture or cost reasons. The on-premises LTSC model gives customers a fixed feature set from the release period, while security updates continue during the support window. Microsoft has not tied the October 2026 Office deadline to any newly disclosed pricing or migration incentive.

Server and Windows client deadlines converge

Windows Server 2022 reaches the end of mainstream support on October 13, 2026, according to Microsoft’s lifecycle schedule. Extended support is set to continue until 2031, which gives customers a longer runway for security fixes but ends the mainstream phase for the server operating system.

The same October 13 date also applies to Windows 11 24H2 Home and Pro, which reach end of support then. Windows 11 23H2 Enterprise and Education editions have a later deadline, November 10, 2026.

Those dates land a year after Windows 10’s October 2025 support end, keeping Microsoft’s operating system lifecycle work on the agenda for IT departments that may already have spent budget and staff time on client upgrades. Microsoft has not disclosed customer adoption numbers in connection with these specific deadlines.

Publisher exits without a successor

Microsoft Publisher 2021 is also scheduled to end in October 2026, closing out a product line that began in 1991 as a desktop publishing application for Windows 3.0. Unlike the rest of the Office LTSC 2021 applications, Publisher is not getting a like-for-like replacement in the LTSC 2024 suite.

That creates a narrower but real migration issue for organizations with archived Publisher files or workflows built around the application’s proprietary file format. Microsoft has not named a direct substitute for Publisher in the materials referenced by the lifecycle schedule.

Identity policy retirement raises risk-management work

Microsoft is also retiring Entra ID Sign-In risk policies on October 1, 2026. The capability was previously known as Identity Protection. Microsoft is directing administrators to move relevant controls into Conditional Access and to ensure policies account for both user risk and sign-in risk.

The practical consequence is that risk protection tied to the retiring policy mechanism will stop after the retirement date if administrators do not update their configurations. For organizations using Microsoft 365 and Entra ID at scale, this is likely to be a configuration and audit project rather than a conventional software upgrade.

October 2027 appears lighter based on the dates cited, with SQL Server 2017 the major product listed for end of support then. The heavier 2026 schedule gives IT teams a finite window to handle product replacements, support transitions and identity policy changes before Microsoft turns off or downgrades support across several widely deployed products.

This story draws on original reporting from The Register.