I just migrated users from SBS 2008 to 2010. Most users just reset their smartphones and they are syncing to the new server. Three users, two with IPhones and one Windows Mobile are not syncing.
The event logs on the new server show MSExchange ActiveSync event id 1008
An exception occurred and was handled by Exchange ActiveSync. This may have been caused by an outdated or corrupted Exchange ActiveSync device partnership. This can occur if a user tries to modify the same item from multiple computers. If this is the case, Exchange ActiveSync will re-create the partnership with the device. Items will be updated at the next synchronization.
Their phones do not show up in OWA..
They have removed the accounts, rebooted the phone and reset the accounts.