Checking the Size of Your Mailbox

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  • 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.