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List all Inactive Mailboxes in Office 365

Jul 13, 2014 by Emma Robinson

Microsoft have added the Inactive Mailbox feature to Office 365 which allows you to keep a terminated employees mailbox on your Office 365 cloud environment even after you have deleted their user account and freed up their licence.

We have developed a report that shows you all of these mailboxes in an easy to view and filter table.

Inactive Mailbox Report

Inactive Mailbox Report

The report shows you extended information about these archived mailboxes including:

  • Mailbox Creation Date
  • User Deletion Date
  • Email addresses and UPN

We will be continuing to develop this report further over the coming months to add additional fields and information. Please explore our Office 365 reporting software to utilize our full reporting capabilities.