Microsoft is using the KB5021751 update to see if you have an unsupported version of Office installed
Earlier this week, Microsoft released the KB5021751 update. Unusually it has no fixes or new features for users whatsoever -- it is an update purely for Microsoft's benefit.
Designed for Office 2007, Office 2010 and Office 2013, the slightly sinister-sounding update "will run one time silently" and gather information that is then fed back to Microsoft.
Future versions of PowerShell can be downloaded via Microsoft Update
Most people are familiar with the idea of using Windows Update to... well... keep Windows up-to-date. But there is also Microsoft Update which is used to keep other Microsoft software updated, and it can now be used to update PowerShell.
The announcement from Microsoft that PowerShell updates will be delivered through Microsoft Update will be welcome by anyone who dislikes the process of checking and updating the software via GitHub.