A coworker was installing Windows 2003 R2 Server OEM 64-bit onto a server. According to Microsoft, you are allowed 4 Windows virtual servers. He needed to have Windows 2003 R2 Server OEM 32-bit (probably for some software that doesn't work in a 64-bit environment), so he was going to install it in a virtual server. Surprise, the license key for the 64-bit version does not work for the 32-bit version, so he calls up Microsoft support to ask how to setup his, according to them, allowed 4 virtual servers with a different version of windows.
