Our small business is currently running sbs2003. The "higher-ups" have decided they want the newest exchange server and they don't want it to run on the same box as our existing sbs server. I know there are other options for email that would be cheaper, but this is what I've been given. My question is, can I install a Windows Server 2008 R2 Standard edition into an sbs 2003 active-directory? We have a small company and it would not be a lot of work to create a new AD domain and add the users for the new exchange server. I'm wondering what's the best, separate AD domain or same AD domain and would like opinions on what I'm looking at.