Adjust resource mailbox calendar permissions on Exchange 2010/2013 using PowerShell

Quick one today.  By default, when creating a room resource mailbox, Exchange will grant default permissions of AvailabilityOnly for any user (default), if you are after people knowing who has booked a room or resource then you can adjust the permissions to Reviewer. The quickest way to do this is via PowerShell, you can use the following cmdlet;

Add-MailboxFolderPermission -Identity MeetingRoom2:\Calendar -user "Staff - All Staff" -AccessRight Reviewer

I am using a group (called Staff – All Staff) in the above that does not have any permissions already applied to that mailbox calendar. If the user or group already has some kind of permission, you will need to use Set-MailboxFolderPermissions instead of Add-MailboxFolderPermissions.

If you have multiple Resource Mailboxes, you can pipe a Get-Mailbox to hit them all at once like so;

$rooms = Get-Mailbox -RecipientTypeDetails RoomMailbox
$rooms | %{Add-MailboxFolderPermission $_":\Calendar" -User "Staff - All Staff" -AccessRights Reviewer}

Hope that helps.

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