Microsoft is pushing the KB5021751 update to find out how many of its customers are using an Office version that has reached its end of support or will soon be out of support.
StacyNWilson (@StacyNWilson1) / X
Microsoft is using the KB5021751 update to see if you have an unsupported version of Office installed
How do I stop KB5033375 from reinstalling itself? - Microsoft Community
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Click to run crashes at the end of Office 365 installation on Windows - Microsoft Community
Microsoft pushes KB5021751 to check for outdated Office installs
Updates for Office are ready to be installed, but first we need to - Microsoft Community
KB5034441 is still a menace 1 month after release. Can you patch it, Microsoft?
The Twisty Maze of Getting Microsoft Office Updates