The Ubuntu SE site has an interesting debate happening. See "How would #1 Bug would be fixed if AskUbuntu uses a Windows Platfrom?" and "Reception of askubuntu.com ", which links to outside discussions about the debate.
It seems like there are some objections to using a closed-source Windows-based application to host an Ubuntu Q&A site.
What is our attitude towards this question?
My first reaction is that using proprietary software is not a problem. This site is for "Unix", and there are plenty of commercial variations of Unix (Solaris, MacOSX, RedHat, etc.) as well as Free versions (CentOS, FreeBSD, Linux, Cygwin, etc.). The SE platform is a good tool, the content is covered under an open license, and I don't object to using closed-source products underneath.