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.