I have a client running Small Business Server 2008. Lately, the client complained that they could not move or delete emails from their iPhone. Each time they attempt, they receive the message "the message could not be moved to the mailbox trash." I attempted to reset all of their iPhone settings, replace the phone and even try to connect to their mailbox via an Android device to no avail (the Android device did not give the same message, but attempts to move or delete items simply failed). I have not seen any errors in the standard Windows Event logs and I am not sure where else to look or what else to do. Any ideas?