Historically, Sun hired John Ousterhout and that didn't turn out terribly well for TCL backing by Sun.
IIRC, the original research was going to be into making Haskell for .Net, but there were enough issues (in particular, being purely functional makes interop with C# and the existing .Net libraries radically more difficult) that ML seemed like a better fit.
It is. When you launch Visual Studio >= 2010 it's there alongside C# in the Project Creation wizard.
http://msdn.microsoft.com/en-us/vstudio/hh388569
Microsoft also sponsors Haskell and OCaml research via Microsoft Research centers.
Java and C# helped their companies do that.
But with Python,Tcl and Haskell its a little different. Its good for the companies if they off, but if they don't they don't loose anything.