Migrated from Exchange 2003 ActiveSync to Exchange 2010 ActiveSync

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?
toddturnerAsked:
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IvanSystem EngineerCommented:
Hi,

for active sync to work, there should be just 1 thing to reconfigure, by default.
That would be to apply patch on Exchange 2003 https://support.microsoft.com/en-us/kb/937031 
After patch is installed, add Integrated Windows Authentication. This will Proxy Exchange 2010 ActiveSync to Exchange 2003
After you move mail flow to Exchange 2010, everything should work.
Important note: In case you have only 1 Exchange 2003 (just Back End role), you need to reconfigure Microsoft-Server-ActiveSync virtual directory, because Exchange 2010 will proxy ActiveSync requests from mobile devices to Exchange 2003 via port 80 (HTTP) and not via HTTPS.

Important:
This is required ONLY if you have one Exchange 2003 server (BackEnd). If you have both FrontEnd and BackEnd then proxy redirect would be done via HTTPS, and no configuration change is required!!!

Useful link: http://www.msexchange.org/blogs/walther/news/exchange-20032010-activesync-coexistence-lesson-learned-605.html

That is it.. Have you done all this?

Regards,
ivan.
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