I have the same problem. It would appear that our office manager has somehow
removed all the recipients from it except the room (which is a resource) and
now we can't delete it. I'm a domain admin, so should have permissions to do
most things, and still can't get rid of it.

I've tried using mdbvu32.exe to open the folder, but it won't let me open
the message store. I'm not sure if this because there's no inbox for a
resource, or if it's a permissions issue - domain admins (and all the other
administrative groups) are explicitly denied "Full mailbox access" on the
resource mailboxes, which is inherited from the parent object... i can't
figure out which parent object, or how to change that.

Help? This meeting room is now neatly tied up in the calendar until the end
of December, so it'd be nice to be able to free it up.

Cheers,

Kev