I am wondering if it is possible to have Exchange 2010 and 2007 in coexistance with 2007 handling the "front end" duties while we test the new server out? Basically I don't want to swing OWA or Outlook Anywhere over while we have a couple test users on 2010 and make sure everything is configured how we like then swing it over in a week or so. I do hope to be able to have mail delivered to those test users though.

i did this scenerio for couple of weeks. mail flow works good. but owa and outlook anywhere does not work if your mailbox is in ex2010. i would suggest to create a test mailbox in ex2010 and play around. once you are sure ,then swing to ex2010 cas as internet facing. bottom line, go ahead :) Thanks Uday Kiran, Senior Consultant Cyquent Technology Consultants, Dubai Please Mark as answer if it helps you

Hi C-M, Any updates? And I would suggest you follow the below link to make a upgrade. Exchange 2007 - Planning Roadmap for Upgrade and Coexistence http://technet.microsoft.com/en-us/library/dd638158.aspx Frank Wang TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Hi C-M, Any updates?Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.