I am going to be implementing a new network soon and will be purchasing 64 bit servers. I understand that I can run 32bit os. But, I want to run exchange 2007 which is only 64 bit. My question is, what are the affects of running all 64 bit servers with only 32 bit clients, or 64 bit AD and 64 bit exchange with 32 bit file and print servers. What is the correct way and are there any consequences to running mixed 64 bit 32 bit client\server environment. Also, is my thinking correct that if you have a 64 bit os, you can still install 32 bit applications on it.