MS recommends Cygwin

Andy Koppe
Thu Mar 15 11:42:00 GMT 2012

"Features Removed or Deprecated in Windows Server "8" Beta
The Subsystem for UNIX-based Applications (SUA) is deprecated. If you
use the SUA POSIX subsystem with this release, use Hyper-V to
virtualize the server. If you use the tools provided by SUA, switch to
Cygwin or Mingw."

More information about the Cygwin-talk mailing list