Microsoft October 2026 EOL Products: UK Buyer Checklist

A crowded October for Microsoft admins

Barely a year after Windows 10 exited support, Microsoft has lined up another wave of retirements for October 2026. The Register reports that Office LTSC 2021, Windows Server 2022's mainstream support, Windows 11 24H2 Home and Pro, and Publisher 2021 all reach their end dates that month, alongside the retirement of Entra ID Sign-In risk policies on 1 October 2026. Windows 11 23H2 for enterprise and education gets a slightly longer reprieve, running until 10 November 2026.

For UK organisations, the clustering matters more than any single date. Procurement, testing and change-approval cycles rarely move fast enough to absorb several major transitions in the same quarter, particularly where server refresh and desktop refresh sit with different budget owners.

Office LTSC 2021 and Publisher: the forced choice

Everything in the Office LTSC 2021 family — Access 2021, Word 2021 and the rest — loses support in October 2026. Organisations avoiding the cloud face a binary choice: move to Office LTSC 2024, which is a fixed on-premises snapshot with security patches only, or shift to Microsoft 365, which Microsoft clearly favours. Neither path suits every buyer, and the decision deserves proper comparison rather than default acceptance; our Microsoft 365 versus Office 2024 breakdown sets out the trade-offs.

Publisher 2021 is a smaller but genuinely awkward casualty. Unlike the rest of the LTSC 2021 suite, Microsoft isn't offering a direct replacement or a path to preserve its proprietary file format, so any team still relying on Publisher for internal documents needs a file-migration plan now, not in September.

Windows Server 2022 and the Windows 11 patchwork

Windows Server 2022 drops out of mainstream support on 13 October 2026, though extended support runs until 2031 — a longer runway than desktop products get, but one that still needs active tracking. The same date closes out Windows 11 24H2 for Home and Pro editions, while enterprise and education customers on 23H2 get until 10 November.

Layered on top of this is the wider Windows Server 2012 Extended Security Updates window, which BleepingComputer confirms also runs to 13 October 2026, and the Windows 10 consumer ESU period that started 15 October 2025 and now closes in October 2027. Buyers running a mix of these platforms should map every device and server against its actual end date rather than assuming one October deadline covers everything — a task made easier with a proper storage end-of-life checker and server end-of-life checker run across the estate.

Entra ID and Exchange: the quieter risks

The retirement that could cause the most silent damage is Entra ID Sign-In risk policies, formerly Identity Protection, which Microsoft is switching off on 1 October 2026 in favour of Conditional Access. Organisations that haven't migrated their user- and sign-in-risk coverage into Conditional Access policies before that date simply lose that protection layer — no fallback, no grace period mentioned. One Register reader put the risk bluntly: "Given how many orgs use O365 I can't see how disabling sign-in protection might go wrong."

Related but separate, Microsoft is also disabling Exchange Web Services by default for Exchange Online tenants as soon as October 2026, with final shutdown on 1 April 2027, according to TechRadar and IBM's own customer notices — a change that specifically threatens legacy integrations still calling EWS against cloud mailboxes, while on-premises Exchange Server continues to support it.

What UK buyers should action now

The practical answer for most UK IT teams is to treat October 2026 as a single planning milestone even though the underlying products are unrelated. Inventory every Office LTSC 2021, Windows Server 2022, Windows 11 24H2, and Entra ID/EWS dependency now, and get change requests into the pipeline before the fourth quarter.

Where budgets can't stretch to a full refresh before the deadline, third-party maintenance for extended support can buy time on hardware that's still functionally sound, and a downtime cost calculator helps quantify what an unpatched or unsupported system actually risks in operational terms. For estates weighing a full move off Windows Server 2022 or older platforms, our guide to migrate end-of-life servers and the wider planning for server EOL resource both map out realistic timelines against procurement cycles.

• •Audit Office LTSC 2021 installs and decide LTSC 2024 vs Microsoft 365 before Q4 2026
• •Confirm Windows Server 2022 patch level and extended-support enrolment status
• •Migrate Entra ID Sign-In risk policies into Conditional Access before 1 October 2026
• •Check any custom tooling still using Exchange Web Services against Exchange Online
• •Flag Publisher 2021 files for conversion given the absence of a replacement product

Looking past October into 2027

Microsoft's own roadmap suggests a calmer stretch afterwards — October 2027 currently shows only SQL Server 2017 reaching end of support, and Office Online Server isn't retired until 31 December 2026, giving SharePoint Server SE and Exchange Server SE customers a little extra runway on that specific integration. That relative lull is worth using deliberately: buyers who get the October 2026 wave cleared early will have capacity to plan the next refresh properly rather than reacting to it, and can use tools like a cloud vs on-premise TCO calculator to decide where cloud migration genuinely pays off versus where on-premises extension remains the cheaper option.