I've seen this problem a handful of times with Outlook 2019 starting in November or December 2021. So maybe it's the result of an automatic update.



The screen corruption always happens while I'm typing an email message. The only solution I've found is exit Outlook and restart the program.



The trigger appears to related to pressing modifier keys (Shift, Alt, and/or Ctrl) along with something else (an alphanumeric? an arrow key?) Perhaps the problem does not affect folks who drive Outlook primarily by mouse. (I rarely reach for the mouse when I'm using Outlook.)