Monday, March 29, 2021

Microsoft March 2021 "C" Release Preview Cumulative Update for Windows 10 Versions 2004 and 20H2

Microsoft released the monthly “C” release preview cumulative update with non-security improvements and fixes for Windows 10 Versions 2004 and 20H2.  Both versions are receiving the same KB5000850 with a long list of key changes which can be viewed in the KB article.  Note, however, if you installed earlier updates, only the new fixes contained in this package will be downloaded and installed on your device.  


Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). If you encounter the error, 0x800f0823 – CBS_E_NEW_SERVICING_STACK_REQUIRED, close the error message and install the last standalone SSU (KB4598481) before installing this LCU. You will not need to install this SSU (KB4598481) again for future updates.

To download and install the update, go to Settings -> Update and Security -> Windows Update and select Check for updates. To get the standalone package for this update, go to the Microsoft Update Catalog website.

Windows Version 2004 (Build 19041.906) and Version 20H2 (Build 19041.906), KB5000850:  

If you are using Windows Update, the latest SSU KB5001205 will be offered to you automatically. The SSU update addresses an issue that might prevent the CVE-2020-0689 update from installing. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.


  • Updates an issue with zoom that occurs when using Microsoft Edge IE Mode on devices that use multiple high-DPI monitors.
  • Updates an issue that makes high dynamic range (HDR) screens appear much darker than expected.
  • Updates an issue that causes video playback to be out of sync in duplicate mode when you use multiple monitors.
  • Updates an issue that displays nothing or shows “Computing Filters” indefinitely when you filter File Explorer search results. 
  • Updates an issue that makes the split layout unavailable for the touch keyboard when you rotate a device to portrait mode. 
  • Informs users when a child account in the Family Safety plan has administrative privileges. 
  • Updates an issue that prevents you from closing Toast Notifications using the Close button on touchscreen devices. 
  • Updates an issue with 7.1 channel audio technology. 
  • Updates an issue that causes a device to stop working if you delete files or folders that OneDrive syncs. 

Note:  This update also removes the Microsoft Edge Legacy desktop application that is out of support and installs the new Microsoft Edge. For more information, see New Microsoft Edge to replace Microsoft Edge Legacy with April’s Windows 10 Update Tuesday release

For information about the the types of updates released by Microsoft each month see Windows 10 update servicing cadence primer.

Windows 10 update history

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