Changing AD login's to reflect new SMTP addresses set in exchange... will it break connection to smartphones that use activesync?

Hello,
My organization is in the process of migrating mailboxes from Exchange 2003 to 2010. In addition to migrating we are also changing the login's in users AD objects. These users also have smart phones that are configured via activesync. I've come across a
few users that when we change their login names. It breaks the activesync configuration on their smartphone. Is there a tool available that will help carry over the new login and won't break the activesync connection?

Hi,
Any update?
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Andy Qi
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