In Exchange Admin Center, in Recipients > Resources: I have created several room Resource Mailboxes. Our Outlook 2013 clients can view the calendars and book rooms as expected.
Outlook 2007 clients receive a dialog box "You do not have permission to view this calendar" "Do you want to ask Training Room to share his calendar with you?" when trying to open the resource.
I need to know how to allow Outlook clients permissions to the Resource Mailboxes.
FWIW: We do not have enough Office 2013 Licenses to upgrade the Office 2007 users.