Microsoft is distributing an update that is only intended to determine how many users are still working with the outdated Office versions 2007, 2010 or 2013. The end of support has already been reached for Office 2007 and 2010, for Office 2013 support ends in April 2023. The update KB50211751 runs in the background after downloading, like Swiss IT Magazin reportedand sends the data on the Office version used back to Microsoft.
The update KB50211751 should be via microsoftupdate become available where to download it. According to Microsoft, the update runs “once and silently” (in the background) without installing anything on the user’s device. A restart after downloading is not necessary. What exactly you collect with the update is specified by Microsoft on the corresponding Update Support Page not explained.