Looks like Microsoft wants everyone to be using Messenger clients with .NET Passport SSL authentication. That is MSNP8 and MSNP9, used in MSN Messenger 5 & 6, as opposed to MD5 in MSN Messenger 4.x and below, also versions of Windows Messenger below 4.7.2000. This will probably, eventually, force all third party clients to upgrade to at least MSNP8.
It appears when you sign in with a non SSL client, you will recieve an email from dot_net_msgr_svc@msgr.hotmail.com warning you to upgrade. Although some claim to be recieving up to 40 emails in a 9 hour period, and while their computer being turned off.
Just to be clear, official client minimums are:
- MSN Messenger 5.0
- Windows Messenger 4.7.2000
- MSN Messenger for Mac 3.5
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