Migrated from Exchange 2003 ActiveSync to Exchange 2010 ActiveSync. For all users that now have their 2003 mailboxes moved to 2010, they have to recreate their ActiveSync account on their phones for Exchange Server 2010. I noticed that a new Active Directory object called 'ExchangeActiveSyncDevices' gets created the minute the user recreates the ActiveSync account on their phone for Exchange Server 2010. These AD 'ExchangeActiveSyncDevices' objects are not on any existing AD users that use ActiveSync in Exchange 2003 and their mailbox hasn't been moved yet. This new AD 'ExchangeActiveSyncDevices' object also contains an AD object, where the name of the AD object, contains the brand of the phone embedded in the AD object name, eg) 'ExchangeActiveSyncDevices' -> iPhone§Appl8712777SEDG. The iPhone§Appl8712777SEDG has an object class type of msExchActiveSyncDevice. I have only migrated 2 users because of this issue. Is this normal and will every user need to recreate their ActiveSync account on their phone once their mailbox is moved from 2003 to 2010 or is there a way around this?