Check mailbox size

The Mailbox Cleanup tool gives you a breakdown of your email folders by size, so you can see which folders are taking up most space.

  1. In Outlook 2013, go to File > Info > Cleanup Tools > Mailbox Cleanup
    Mailbox Cleanup...
  2. Click View Mailbox Size... to see the size of your mailbox and all of the folders. This is a good way to identify which folders are taking up most space so you can clean these up first

    Mailbox Cleanup
  3. You can pick the options to Find older or larger items which you can delete directly from the results
  4. Click the View Deleted Items Size... button and Empty the folder if you want.
    See the Empty Deleted Items page for more information on removing deleted items

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