1. In the top navigation bar select Folder then New Search Folder.
2. In the popup window, scroll down and select Large Mail>Choose and then type the email size you would like to view.
Start off with 1000 (1mb), you may find that you only need to do a few to decrease your mailbox size. If you are still oversized after doing 1000, retry the process searching for mail greater than 500 kb instead.
3. Outlook will display all emails larger than the size you specified. Remove the attachments in the email or delete the emails to decrease your mailbox size.
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