I am working on upgrading to Exchange 2010 from 2003. I am having an issue moving the public domain name from the 2003 box to 2010 so that existing Outlook and iPhone ActiveSync connections will route through 2010. When I move the DNS, any Outlook or ActiveSync connection cannot connect to email any longer. Am I missing something basic or am I on the wrong track entirely? Detail below....
Domain name = webmail.company.com
Remote users with webmail.company.com configured in Outlook (with HTTP proxy) and iPhone
SSL cert webmail.company.com and with subject alt names covering legacy, mail, autodiscover
Installed with Hub, Client Access and Mailbox
Domain name - mail.company.com
Same SSL cert as above.
Client access array is configured for mail.company.com
Some other details
* OWA for 2010 routes a 2003 mailbox user successfully via legacy.company.com
* mail flow is routing through 2010
I thought the exchange 2003 coexistence is that users can be moved to 2010 without hands on each user. If I move webmail.company.com to 2010, what is the expected configuration or method for Outlook or ActiveSync clients to successfully proxy through 2010?
I've also tried another test where I moved a mailbox from 2003 to 2010. My remote Outlook and ActiveSync connections did not work through 2010 with the DNS change of webmail.company.com (moving from 2003 to 2010) or even by reconfiguring the remote connection to mail.company.com. It's starting to look like each user's PDA and Outlook needs to be touched for this upgrade!