It’s annoying getting an important email with an irrelevant or missing subject line. Sure, you can categorize your mail to help you find it later, but nothing beats a useful subject line when you’re looking at your search results. Outlook has a little-known feature that lets you edit the subject line of emails you’ve received, making this annoyance a thing of the past.
The ability to edit subject lines is part of the folder view settings. To access these, head to View > View Settings.