I mean: if I have a room mailbox, its calendar stores all the meetings until when? Forever? Does the Exchange Server has any limitation? I need to export information from the room's calendars for some report tasks, and I need to be sure I won't miss any old meeting for each room. Thanks in advance for your information.

Unless you have enabled archving via Outlook ( and users open this mailbox directly with Outlook, not just as shared folder) or you have managed folder policies or 3rd party archving running against the malbox, the meetings will not be removed and will be there "forever".

OK. Thank you very much for the information Andy.