Guess who can use MbUnit or NUnit but not MSTest.
Users of Visual Studio Team System 2008 Architecture Edition. That is who!
http://elegantcode.com/2007/11/20/visual-studio-team-system-2008-architecture-edition/
It is just another reason to scrap MSTest altogether. Just ignore its inferiority. Ignore its silly integration with Studio which can be had for free via NUnit in SharpDevelop. Ignore its confusing availability in various projects. Just use NUnit or MbUnit.
I could go on much further with the list of things you must ignore to sanely choose MSTest. Instead I will list only two more things. NUnit works great with Mono on Linux. NUnitForms is a sweet way to unit test forms.
tru.dat.