Check the Mailbox Usage of Staff/Departmental/Retiree Accounts

A. Webmail Interface (OWA) - Exchange 2019 (On Premise)

  1. After login to webmail interface, select Settings setting at the top right.  
  2. Choose Options.

    check usage 01

  3. The Mailbox Usage will be displayed as shown below.

    check usage 02

B. Webmail Interface (OWA) - Exchange Online

  1. Go to
  2. Enter your and PIN. Click Sign In.
  3. Select Settings at the top right.
  4. Choose View all Outlook settings.
  5. Go to General > Storage.

    Go to General > Storage