In March there was little enthusiasm for this change. However, since then the MiniAccumulo cluster has been ported to Windows. If people want the MAC on Windows, then the whole system should be compilable ... if not executable.
http://affy.blogspot.com/2013/03/running-accumulo-unit-tests-on-windows.htmllists the the non-working tests; at least those that did not work in March. Can we vote on this change? Most of the work has already been done. It seems harmless.