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How to check my M365 mailbox usage?

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You can check your M365 mailbox quota and usage of Microsoft 365 Outlook Web App (OWA):

  1. Login your M365 account with Microsoft 365 OWA.
  2. Click “gear” icon  at the top-right corner of OWA window. Select “View all Outlook settings“.



  3. Click “General“, then”Storage“. The mailbox usage will be shown.

    Mailbox Usage

Original Information Posted at:
cityu.edu.hk/csc/deptweb/support/faq/email/o365/mailbox_usage.htm
Retrieved: 6/18/21

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