Hello,
Currently we have two servers in our Exchange environment with fqdn exchange@domain.com and a SCR server named exhange2@domain.com. The external and internal URLs and the primary certificate names are all exchange.domain.com. Exchange2013 is installed and the redirection URLs on 2007 have been changed to legacy.domain.com and the Outlook anywhere proxy address is left at exchange.domain.com. ActiveSync and OWA works perfectly for all users on any of the servers. But for Outlook users, it only works if their mailbox is on the new Exchange 2013 or the exchange2@doamin.com. When a user with mailbox on exchange.domain.com tries to connect they repeatedly get login prompts. I suspect having the 2007 server the same name as the primary certificate which we prefer not to change is causing the problem.
Other than moving all mailboxes and public folders to the exchange2 server (which is rather challenging due to it's resources) and decommissioning the Exchange.domain.com, can anyone tell me if there is another solution where I can keep all servers in coexistence for a while while we migrate everyone to 2013 servers?