The Mailbox server %1 that hosts the mailbox for mobile phone user %2 is running version %3]. Exchange ActiveSync only supports ...

The Mailbox server [%1] that hosts the mailbox for mobile phone user [%2] is running version [%3]. Exchange ActiveSync only supports Exchange mailbox servers that are running Exchange 2003 or later versions. If you don't want the user to use Exchange ActiveSync, disable the user for Exchange ActiveSync. If you want the user to use Exchange ActiveSync, move the user's mailbox to a Mailbox server that is running Exchange Server 2003 or later versions.