Outlook 2003 and 2007
- Open Outlook.
- Right-click on your name in the folder list. Click on Properties for "your name" from the list of options.
- Click on Folder Size.
- A new window will pop-up listing the folders in your mailbox and two sizes. The important one is Total size. Total size tells you how much space each folder in your mailbox is using. Typical folders that will be very large are Deleted Items, Inbox, and Sent Items. You will want to delete any messages that you no longer need. Any messages that you do not want to delete should be archived.
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