Good day

I have a 2003 and 2010 exchange coexistence environment.My environment is quite large  and i am in the process of migrating to 2010, some sites will be migrated to the Cloud Hosting services provider.One of the 2003 server is running out of space and i just wanted to replace it in the interim.When ever  i try to run a set up i encounter the error, shown below.I have checked my permissions i have full exchange admins,I have also tried to run the domainprep but still no luck.My questions is, is it because i have exchange 2010 in the environment? Thank you

That's probably the cause of your problem. See more information here: http://technet.microsoft.com/en-us/magazine/ff394355.aspx