As I stated in my thread about “The Patchening”, a plan that aims to achieve what you plan to make possible, the problem is that post-XP, Windows uses a DLL named ppcrlconfig that aids MSN in connecting to RST.srf, and that DLL is hard to get cooperating when modified. I haven’t been able to see what happens with RST authentication on XP, as my setup makes it virtually impossible for it to connect to my local HTTPS server, but I assume it should be a piece of cake on there. 
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