This is wher they are on my Q1. Here go..
HKLM/Services/WindowsLive/Platform/Passport/Server=
https://login.live.com/RST.srf
HKLM/Services/WindowsLive/Platform/Transport/Server=
tcp.mws.mobile.live.com
it seems I saw more elsewhere but it could of been a previous version. I'd be pretty amazed if changing those worked and they probably would revert back after a reboot. Good luck!
Worse case you could use web-based hotmail until the server issue is cleared up.
Let me know if there are any other strings you would like to try..