To delete an inbox rule on Office 365 Outlook, please do the following: 

  • Click on the gear icon in the upper right hand side of the window.

  • Select Mail under Your app settings. The options menu will appear on the left hand side of the window.

  • Under Mail and Automatic processing, select Inbox and sweep rules.

  • If you have already had any rules set up, they will appear in the Inbox rules box. Select the rule you want to delete and then select Discard at the top.

  • Click Save.

Tip: If you just want to turn the rule off for a while, clear the check box next to the rule.