Another viable solution you can try as it relates to specifically the Outlook client installed on your Windows 11/10 computer is to perform System Restore ... A folder was inadvertently deleted.

Learn why deleted emails in Outlook keep reappearing and discover effective solutions to prevent this issue. Additionally, ...

You can recover deleted emails in Outlook by moving them back to their original folder or using the Recover Deleted Items ...

First, it doesn’t ask you for confirmation, and second, it moves the deleted sticky notes into the trash folder. So, if you removed it just now, Outlook Trash is your best bet to recover it.