Assume that you have a room mailbox that has the BookingWindowInDays
parameter set in a Microsoft Exchange 2013 environment that has cumulative update 9
or cumulative update 10
applied. When you schedule a meeting for the room mailbox outside the value boundary of the BookingWindowInDays
parameter, you can't receive an "Accept" or "Decline" response from the room mailbox. Additionally, the availability of the room mailbox calendar is still displayed as "Tentative" during the period of the meeting.