Exchange 2007 : You cannot open free/busy information

Exchange 2007 : You cannot open free/busy information

I had a user who was unable to add calendar entries to a Room Mailbox calendar. The error she received was:

You cannot open free/busy information. You do not have sufficient permissions to perform this opertation on this object.

This was caused by the user not having full mailbox permissions on the resource mailbox. Use the following command to configure mailbox permissions to allow the user to create new entries in the calendar:

Add-MailboxPermission -Identity “Room Mailbox 1” -User ‘domain\user’ -AccessRights ‘FullAccess’

You can also use the following command to apply this change to a number of similar named mailboxes, this command assumes that all the room names start with ‘Room’:

get-mailbox “Room*” | Add-MailboxPermission -User ‘domain\user‘ -AccessRights ‘FullAccess’