I have a problem with a room mailbox we use as a department calendar. Every so often it updates itself and changes an entry. For example a holiday would be booked in for 2 weeks and it would be changed to the first day from 8.30am to 9am. I thought I had resolved this by altering the Automate Processing setting and the Allow Conflicts settings. However the problem has come back and I can't figure out why it's happening.