Macworld - Parallels: Run Windows, Linux servers on Mac mini
Parallels Server for Mac 4.0 Mac mini edition installs on Macs running OS X Server. Once it's up and running, you can then install Windows and Linux server operating systems on the same machine, and those other OSes can run concurrently with OS X. If you now maintain Windows- or Linux-based servers just to run platform-specific apps… you could instead consolidate everything on a Mac.

School News
Richard Bowler, director of technology for the Hardin School District in Montana, said his district opted to install Parallels Server for Mac 4, a virtualization technology optimized for Apple server hardware, which installs directly onto existing hardware and its host operating system and consolidates Windows Server applications on Apple hardware…

Info World - Parallels Server for Mac 4 is optimized for Mac OS X
Parallels fills the niche market for small-business players running Snow Leopard and Windows 7 on Apple servers.

Parallels Server for Mac 4.0 gains Virtual Automation, Snow Leopard and Windows 7 support