To resolve Outlook visibility Issue reported 12 May 2021.

Roll Back your Microsoft Office Version:

• Press Window Key and R – to bring up run window
• Paste the following line in the open box and click ok

"C:\Program Files\Common Files\microsoft shared\ClickToRun\officec2rclient.exe" /update user updatetoversion=16.0.13901.20462

If above does not work, try with the speech marks removed like below.

C:\Program Files\Common Files\microsoft shared\ClickToRun\officec2rclient.exe /update user updatetoversion=16.0.13901.20462

Microsoft Office will then roll back to a previous version, this may take a few minutes

When it has completed you can use Outlook again.

Fun times…….