I have tried (3) times to install the free demo version of 3CX onto a Vista Business 64-bit computer (Core 2 Quad CPU 2.66GHZ, 4GB ram, 500GB HD) to evaluate the software before purchase. At the end of the wizard installation, (starting core services) I get a time out error and FAIL! message from starting core services. I think that all prerequistes have been met, I even installed dot.net 3.0. This box resides in the local domain network, 3CX wizard would not accept FQDN but allowed IP address. Any ideas of what to do? Can this be installed on the Exchange 2007 server if Excahnge 2007 UM is not utilized. From what I've read, 3CX has it's own robust unified messaging?