December 2021 CU for Office Online Server is available for download

The product group released the December 2021 Cumulative Update for Office Online Server.

The KB article for December 2021 CU will be available at the following Location in a couple of hours:

  • KB 5002097 – December 2021 Update for Office Online Server

The download for December 2021 CU is available through the following link:

Related Links:


    1. Hi Sue,

      it’s both – a security update and a cumulative update.

      All security updates for OOS are also cumulative updates.



  1. Is there somewhere a list with the build numbers of office online server? For Sharepoint I found many of them, but not for OOS.


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