In a notable about-face, Apple has changed its stance with regard to allowing Mac OS X Server to be run inside a virtual machine (VM), much as Parallels Desktop and VMware Fusion make it possible to run Windows and other PC-based operating systems on a Mac. Until the release of Mac OS X 10.5 Leopard Server, Apple’s software license agreement explicitly forbade running multiple copies of Mac OS X Server on a single Mac, preventing Parallels and VMware from including Mac OS X Server among the operating systems that could be virtualized legally. Apple’s Tiger Server software license agreement reads:

This License allows you to install and use one copy of the Mac OS X Server software (the ‘Mac OS X Server Software’) on a single Apple-labeled computer at a time.

(Via TidBITS.)

Huge step in the right direction. Ship something VMWare. Please.