Office Online Server OOS

Office Online Server

Every published release for Office Online Server, newest first: what each update changes, whether to install it and any confirmed known issues.

Terms & labels

Label legend

Security: Contains fixes for security vulnerabilities.
Preview: Optional update with new features and fixes, without new security patches. Its content joins the next Patch Tuesday update.
Out-of-band: Released outside the usual monthly schedule, usually to fix a specific problem.
Cumulative: Includes everything from earlier updates, so the latest one is enough.
Zero-day: Microsoft reports a vulnerability that was already exploited or publicly known when the fix came out.
Windows Insider Preview: A pre-release build for testers, not meant for everyday PCs.
Updated: We revised this page after publishing because Microsoft changed its notes.

Build history