To grant access to a resource mailbox, you must use the Exchange management shell.

Assuming you already have the mailbox created, and it is called “ResourceMailboxName”, here is the command you should run:

Add-MailboxPermission -AccessRights FullAccess -Identity ResourceMailboxName -User Username

If you need to grant a different level of permission, use a different option with the ‘AccessRights’ switch.  The other options are:

  • ChangePermission
  • ChangeOwner
  • DeleteItem
  • ExternalAccount
  • ReadPermission
  • SendAs

See these pages for more information on resource mailboxes:

http://msexchangeteam.com/archive/2009/02/26/450776.aspx

http://technet.microsoft.com/en-us/library/aa995916.aspx

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