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How To View Mailbox Size In Outlook

1. Open your Outlook application and click on File.

A screenshot of the Outlook Application with a red arrow pointing at the File tab.

2. On this screen you can see the size of your mailbox, and the current space used located as the third option down on the screen.

A screenshot with a red outline around Mailbox Settings.

A screenshot of the Mailbox settings which shows the size and space used in your Outlook mailbox.

Microsoft Exchange Online Plan 1 comes with a 50GB mailbox.

Microsoft Exchange Online Plan 2 comes with a 100GB mailbox.