Technical Details
Any major change made to the protocol, such as a new command or syntax changes, results in a version-number incremented by one in the format of MSNP#. During October 2003, Microsoft started blocking access to Messenger service using versions below MSNP8.
Starting on September 11, 2007, Microsoft forces most current users of MSN Messenger to upgrade to Windows Live Messenger 8.1 due to security considerations. Noticing that Microsoft may end support for the older versions of MSNP in the near future, open source implementations of the protocol (mostly based on MSNP8) now have to consider changing to MSNP13-15. This will require lots of work but will also bring many new features of Windows Live Messenger to the open source clients.
Read more about this topic: Microsoft Notification Protocol
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