Checking the Size of Your Mailbox
- Log in to your computer and open Outlook.
- Right click on the “Mailbox-username” folder.
- Choose Properties (a dialog box will appear).
- Under the General tab click on the “Folder Size” button.
- Outlook will display how much data is stored in your account and give you a breakdown of where the data resides in your mailbox. To convert to MB divide the number by 1024.