MSNP10 is another new protocol version, introduced with MSN Messenger 6.1. More information about it can be found in the following resources. We plan to address it fully eventually, but for now we can only offer some links.

Forum Posts

Several people have posted useful information about MSNP9 on the Discussion Forum. Below is a list of some useful threads in chronological order of their first post.

MSNP10, any new things we should know of? discusses how to get hold of an MSNP10-aware client.
New commands and parameters observed in MSN Messenger 6.1.0.155 discusses new commands which presumably will be found in MSNP10.
[PHP] Bot using MSNP10 makes the claim that you can log in to MSNP10 with an MSNP9 client.
Error 715 after PAG discusses changes in mobile paging that are new in either MSNP9 or MSNP10