Microsoft recently released monthly update KB5003173 to Windows 10 versions 2004 and 20H2. The update KB5003173 brings security improvements for many Windows components.
But the update is causing USB port, Outlook mail and performance issues for many users. It is also failing to install for some users. Outlook mail issue may be widespread as is clear from many threads created in official Microsoft forum by users.
Outlook mail issue:
Outlook in Office 365 does not display downloaded POP3 messages
USB Port issue:
Users have reported facing issues with their USB ports after installing the update KB5003173. This is what one of the users has reported.
USB port not being read after windows update
Fails to install, performance issue & audio error:
Huge performance drop on laptop after update KB5003173
One user has reported that the update is messing audio and group policies.
KB5003173 update crashed audio and messed up group policies