How to Search for Emails With Empty Subject Lines in Outlook

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Emails aptly titled are easy to spot. Emails with odd subjects are renamed on the spot.

Now, how about finding all the emails with no subject at all? In Outlook, this is easy—and you can edit these emails to have proper subjects as well, of course.

Search for Emails with Empty Subject Lines in Outlook

To find emails with empty Subject fields in Outlook:

  • Press Ctrl+E.
  • Type "subject:[]" (not including the quotation marks but with the brackets).
  • To search more than the current folder, select All Subfolders or All Mail Items in the Search toolbar.