troubleshooting Question

Impact on Active Sync during Exchagne 2003 to Exchange 2010 Migration.

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am230089Flag for India asked on
ExchangeEmail ProtocolsiPhone
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Hi
This question is main on the Active sync druing the coexistance and migration phase from Exchange 2003 to Exchagne 2010.
As we are using mail.domain.com as a owa and active sync url for users in Exchange 2003 enviromnet.
Now we are migrating to Exchagen 2010SP2.
Now i have new cert with few other names.
mail.domain.com
legacy.domain.com
autodiscover.domain.com

the question is after Exchanege deployment when i configure my CAS server to SErver the Request for mail.domain.com and legacy.domin.com for request, for OWA it is ok. but When Active sync users access the mail from device , first it will go to CAS Server , CAS check the mailbox and proxy the request to legacy.domin.com(Exchage 2003) Server,
So when it will proxying the request to different address what will be the impact on the active sync ? Active sync automatic detect the chanegs ?
or give me the error messages ?
What will teh impact ?
In my oranization i have 10000 Active sync users and i can't chagne the url in the device, please advice.

Thanks
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