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Microsoft 365 (and Office 365) subscribers get more frequent software updates than those who have purchased Office without a subscription, which means subscribers have access to the latest features, security patches, and bug fixes. But it can be hard to keep track of the changes in each update and know when they’re available. We’re doing this for you, so you don’t have to.
Following are summaries of the updates to Microsoft 365/Office 365 for Windows over the past year, with the latest releases shown first. We’ll add info about new updates as they’re rolled out.
Note: This story covers updates released to the Current Channel for Microsoft 365/Office 365 subscriptions. If you’re a member of Microsoft’s Office Insider preview program or want to get a sneak peek at upcoming features, see the Microsoft 365 Insider blog.
Version 2511 (Build 19426.20218)
Release date:December 16, 2025
This build offers, in Microsoft’s words, “Various fixes to functionality and performance.”
Get more info about Version 2511 (Build 19426.20218).
Version 2511 (Build 19426.20186)
Release date:December 9, 2025
This Patch Tuesday build offers, in Microsoft’s words, “Various fixes to functionality and performance.” The build also has a variety of security updates (see details).
What IT needs to know: Because this is a security update, it should be applied relatively soon. Over the next few weeks, check for reports about problematic issues, and if all seems well, apply the update.
Get more info about Version 2511 (Build 19426.20186).
Version 2511 (Build 19426.20170)
Release date:December 3, 2025
This build includes, in Microsoft’s words, “Various fixes to functionality and performance.”
Get more info about Version 2511 (Build 19426.20170).
Version 2510 (Build 19328.20244)
Release date:November 20, 2025
This build fixes a bug in Outlook that caused users to see “Contacting the server for information” repeatedly when loading some emails.
Get more info about Version 2510 (Build 19328.20244).
Version 2510 (Build 19328.20232)
Release date:November 18, 2025
This build includes, in the words of Microsoft, “various fixes to functionality and performance.”
Get more info about Version 2510 (Build 19328.20232).
Version 2510 (Build 19328.20190)
Release date:November 11, 2025
This Patch Tuesday build fixes a bug in Outlook that caused some recipients to be unable to access OneDrive links shared with them via...