I am attempting to set up conference rooms as a resource. I have the conference room accounts set up. I can schedule these as a resource. I added all users to a Security Group called TESTALL. I granted TESTALL rights to the conference room mailbox as AUTHOR. All my users are in the TESTALL security group. User A creates a meeting with User B as an attendeeand conference room 1 is a resource. The problem is User C can access the shared conference room calendar and delete the meeting!! Can someone please explain why this is happening? -Thanks

Clarify: Set a mailbox as room resource, give user group Author right on room mailboxs calendar, but users can delete other people created calendar items from room mailbox All users can delete each others calendar items from room mailbox? Please help to confirm the affected scope Please help me to go through the permission setting process: 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 Cs outlook, see if you still can delete the calendar item that User A created

Hi, Kmctom, how's the issue now? Any further warning or error in the application log will help for analysis