Since WLM 2009’s going nowhere right now, I thought implementing MSNP21 would be interesting to look into. Unfortunately, it’s situation is much worse than WLM 2009’s, custom DLLs aside. Whenever it tries to authenticate to Escargot’s RST service, it fails instantly, and Fiddler doesn’t seem to pick up anything this time. It might be that Microsoft got a bit more sneaky with the authentication process, but who knows.