This is 2010. I'm using Visual Studio for most of my work and I never had to care about this tabs-vs-space thing. (When I work on Linux I use vim and I believe my macros are set up to use spaces but I'm not completely sure.) I don't even know which one Visual Studio is using and honestly, I don't really care either. It just works. It should be up to the IDE to sort out ridiculously marginal questions such as this.