Delete Emails older than X days

Find and Delete Only Old Items

To do this, click File in the Outlook menu, then press Info. On the right side, click Tools > Mailbox Cleanup.

In the second section of the Mailbox Cleanup menu, mark Find items older than and enter the number of days. Click Find to search your inbox.

You’ll then receive the results for all matching items in that mailbox, not just emails. You can delete the items one at a time or select them as described above. Right-click and pick Delete to remove them.

Alternatively, you can right-click, select Move, and send them to your archive instead.