We are looking to install a BES for one of our clients, and they are currently running Exchange 2000. They are going to upgrade to Exhange 2007 in late March (tentative), so would it cause problems to install the BES prior to the upgrade? I haven't been able to find anything concrete regarding whether this would cause problems or not, but I am trying to find someone who has had experience with this. I have installed BES in Exchange 2003 environments, as well as Exchange 2007 environments, but I have not upgraded Exchange in environments where a BES is already being used.

Thanks in advance for any help you all can provide.

-Derek Brown