September 2020 CU for Office Online Server is available for download

The product group released the September 2020 Cumulative Update for Office Online Server.

The KB article for September 2020 CU will be available at the following Location in a couple of hours:

  • KB 4484503 – September 2020 Update for Office Online Server

The download for September 2020 CU is available through the following link:

Related Links:


  1. Hey, after installing this on my OOS server, I now cannot open documents in word online, excel online Or PowerPoint online, etc?

    Any guidance is greatly appreciated!


    1. Hi Krista,
      I would suggest to open a ticket with Microsoft support to get this analyzed.


  2. Hi, how can we check the office updates version after we have installed the update?


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