I am preparing to upgrade our current Exchange server from 2003 to 2007 and have two questions regarding licensing. First, I will need to reinstall Windows Server 2003 as it is currently run the 32-bit versions and install the 64-bit version. I assume there won't be any issues using the same license as it is the same server, just 64-bit instead of 32-bit?Second, as part of our Software Assurance through Dell we received a license for Exchange 2007. On the license statement, for Exchange Server Standard CAL 2007 it has 0 for Effective Quantity, 50 for Unresolved Quantity, and 0 for Active SA Quantity. Does that mean we have 50 licenses for end-users?Thanks for any help. I'm hoping this will be smooth upgrade,Jordan

x64 is covered under the same license as long as you are keeping the same version of standard/enterprise. It sounds like you've got 50 CAL's, which could either be for per device or per user, I'd check with your Dell rep on that one.