I have a 2007 SP2 setup now. AD is 2008 R2. Can I deploy a pair of 2010 cient access servers to front end my 2007 mailbox servers? I want my clients to be able to connect to ether the 2007 or 2010 client access servers until I'm finished testing. I will also be running these two 2010 CAS boxes behind a pair of F5 BIG-IP load balancers. I'm hoping that all of my clients (Outlook 2010, OWA, POP, IMAP, etc) will use the new load balanced servers when I'm done. Thanks, --Patrick

Hi, You can have Exchange 2010 CAS act as frontend for the Exchange 2007 mailbox servers, but you can have a co-existense. You can read more about how here: http://msexchangeteam.com/archive/2009/11/20/453272.aspx /MartinExchange is a passion not just a collaboration software.

Thanks Martin. That's a good doc. --Patrick