First, confirm that Outlook itself isn't down. Then, restart the program and check your internet connection for problems If ...

This article explains how to hide deleted messages that appear as grayed out and with a strikethrough line in Outlook folders. This information applies to Outlook 2019, Outlook 2016, Outlook 2013 ...

If you are unable to delete emails or folders in the Outlook application, here are some fixes that can solve the issue: Edit, Save, and Delete the Email Hard Delete Emails or Folders Empty Deleted ...