Exchange 2010 - All users can delete scheduled and accepted meetings in a room mailbox

Question

Hello Everyone,
     I have a strange situation.  I created 4 conference room "room" mailboxes for calendaring of the conference rooms.  We tested to see if user A booked a meeting in room 1 - that user B could not go delete or change
that meeting if it was accepted.
     Now - for some reason - user B (or any other user on Exchange) can now go delete any meeting made by anyone and has been accepted on the calendar.  I cannot figure out what has happened to my permissions that is letting this
happen. As far as I know - we have not made any changes to these room mailboxes.   We are Exchange 2010  version 14.01.0355.002.

Answer 1

Hi
Have a try with the steps on this thread
http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/ed89d6ac-0c48-43a8-8ed4-3d4f5d441737
1.       Create a test mailbox as a new room mailbox, remove all permission on the Properties of “Mailbox” and “Calendar”
Notes: Confirm the permission under “Default” and “Anonymous” account is “None”
2.       Use “Delegate” function in “Tools” menu to share calendar for “TESTALL” group as “Author”
3.       Go to the Properties of calendar in room mailbox, confirm “Author” permission
4.       In User C’s outlook, see if you still can delete the calendar item that User A created
Cheers
Zi Feng
TechNet Community Support