How do I delete all (12000+) emails in outlook online?

Answer 1

If you right-click the "inbox" folder and select "empty folder" from the menu, that should delete all of the emails in your inbox. Because the amount of mail you have is rather sizeable, it may take some time for the program to clear the entire inbox.

If you have any other questions or would like more help with Outlook please feel free to send me a message and maybe we can work out time for lessons together.