troubleshooting Question

Migrating from Exchange 2003 to Exchange 2010 - Client Access Server Role

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drivetechFlag for United States of America asked on
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We are in the process of migrating from Exchange 2003 (SBS) to Exchange 2010..  We are currently running BES 4 Express and Activesync for iPhones.  The plan is to install BES 5 on the Exchange 2010 server after it is installed and migrate users over, since there's no direct upgrade bath from BES 4 Express to BES 5 Express.

OWA is externally accessible from  
Sharepoint/Remote Web Worplace is accessible on the same server from

If make the Exchange 2010 CAS external domain the same, it will break Sharepoint, since it's on the same server.   It will also break Activesync for current users as well?   I'm assuming BES continues to work though?

Can I do the following?

Keep for the current server
Make the CAS external domain and externally accessible.

As we move users over to the Exchange 2010 server, we will have them re-configure their iPhones and Outlook to go to  I'm assumingwe'll have to create a new profile in Outlook, and that it won't just migrate them over.  And, if they have a BlackBerry, we will re-activate them on the BES 5 server after we move them.

Will this option work?

Justin Durrant
Sr. Engineer - Windows Server/Virtualization

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