1. Open Outlook 2010.
2. Click the File tab.
3. Click Info.
4. Review the data under "Mailbox Cleanup".

IMPORTANT: Please note the actual mailbox size is not shown. The total size represents the point when size-limit warnings are issued.
1. Open Outlook 2010.
2. Click the File tab.
3. Click Info.
4. Review the data under "Mailbox Cleanup".

IMPORTANT: Please note the actual mailbox size is not shown. The total size represents the point when size-limit warnings are issued.