Question : Exchange 2007 to 2010 upgrade

Please help.
I have one Exchange 2007 server running on Win 2008 SP2.
I was trying to upgrade the Exhange to 2010.

When I ran the setup from E2K10 DVD, and selected "install", I get following error.
"A previous version of Exchange Server is already installed on this machine."

I'm trying to install/upgrade the Exchange on the same box.  Obviously, I would not want to lose any data.

Thank you,

Answer : Exchange 2007 to 2010 upgrade

It is not possible to do an in-place upgrade to 2010. You would need to setup 2010 on a separate box and move the mailboxes:
http://social.technet.microsoft.com/Forums/en/exchange2010/thread/7c75bbd4-66a2-4899-a7c6-8d02e6ca2dd5