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How do I create the Public Folder mailbox and database in Office 365?

Last Update: 7/21/2017 11:29 AM
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​How do I create the Public Folder mailbox and database in Office 365?


  • Log in to Microsoft's Office 365 portal as the admin of the Office 365 tenant. We recommend that you use the Office 365 admin in the migration project. Note: The Office 365 admin must be licensed and have an active mailbox in the tenant.
  • Navigate to the Office 365 Admin Center. To create the Public Folder Mailbox, click on Admin centers > Exchange > Public Folders > Public Folder Mailboxes.
    • Click the plus sign (+).
    • Name the Public Folder mailbox, and click Save. This may take a few minutes; if you get an error, you may need to contact Microsoft Online Services Support for assistance.
    • Double-click on the name of the Public Folder mailbox, click on mailbox usage and note the size of the mailbox. (Public Folder mailboxes are either 50GB or 100GB, depending on the license used by the administrator.)
  • Click Public Folders > the ellipsis (…) > Root permissions.
    • Click the plus sign (+).
    • Click Browse to add the admin being used to log in to the tenant and being used for the migration.
    • Change the permission level to Owner, and click Save.
  • Note: There is no need to create a Public Folder at this time.