Hi,
Though of setting it up on IIS and I have seen here thet with different URL rewrite software it works just fine on IIS too.
Some here at the forum stil say that it should be run on Apache when use IIS, but why? Is it just so you are Linux/Unix lovers and have to diss IIS automatically.
There is nothing, except the rewrite condition, that in anyway make Apache a better server to run it on. Nothing in the php/mysql code of WPMU shows indication that Apache should be run, or? Even runing Apache on Windows is worse than IIS, from performance reason.