I work for a small company and I am looking to upgrade our Exchange 2000 to Exchange 2003. My set up is this: my DC is W2K. I am running E2K Enterprise on another W2K box. I've been checking with my vendor on prices and to upgrade the E2K box with CALS for Exchange and the OS is going to run over my budget allowance. I am looking at the option of SBS. The question I have is can I have an W2K DC and an SBS running just Exchange? I've read threads where if you have SBS, it must be the DC.