We recently let an employee go who had mailbox and calendar rights to a couple other employees. The employee who was let go was eliminated from the exchange server and eliminated from all other employees Outlook settings. However, when employees who provided mailbox and calendar editing permissions to the terminated employee send a calendar invite, and the recipient accepts, the recipient receives a bounce back email saying that the terminated employee's box does not exist, however the employees who send the invite do receive the reply accepting the calendar invite. We are at a loss, as we have completely eliminated the terminated employee from every setting we can think of, and also rebuilt all Outlook permissions. Are there any other things we can try?