This article illustrates how to view your total mailbox size and free/available space within your mailbox account using Outlook 2010.  



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.