I have installed an Exchange 2010 server on my existing Exchange 2003 organization. I wanted to move the Exchange 2003 mailboxes onto the Exchange 2010 server. My problem is, the mailboxes that will be moved to the new Exchange server won't be accessible from the outside world via OWA or through Exchange email setup on smartphopnes. Is there a way to make this work while the migration is going on? Any thoughts would be appreciated.

Have them connect to the 2010 CAS instead. The Deployment Assistant walks you through each step: http://technet.microsoft.com/en-us/exdeploy2010/default.aspx

How do I do this?

Hi, In a coexist Exchange enviroment, you need configure a legancy host name for exchange 2003 server. Follow the steps below: http://technet.microsoft.com/en-us/library/ee332348.aspx Reference: http://technet.microsoft.com/en-us/library/dd638130.aspx http://blogs.technet.com/b/exchange/archive/2009/11/20/3408856.aspxPlease 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.

How do I do this? If you read the Deployment Assistant link I posed earlier it steps you through the process.

Thanks. The only problem on my end is I don't have a front-end server...