Admins for one of our Exchange 2010 accepted domains have reported a sporadic problem where on a few occasions the “Enable the Calendar Attendant” under the recipient’s Calendar Settings tab in the EMC has become unchecked mysteriously on its own, resulting in the recipient having messages delivered to the deleted items folder. We are current with Service Pack 1 and Rollup update 5. It should also be noted that this has happened for just a few accounts, both newly created, and longer standing, and in all cases the mailboxes happen to be linked. Does anyone have an explanation for this strange behavior? Thanks. Alan

Hi, Have you moved the mailbox? Please check the direct book feature is enabled on outlook client. It could cause conflict with Calendar Attendant: 1. Open Outlook->Tools->Options. In Preferences tab, click Calendar options. 2. Click Resource settings, make sure that all options is unchecked.