LOL ! Nice inquiry xpi0t0s !!

plupke : <bla bla bla>
xpi0t0s : <bla bla bla>
plupke : <bla bla bla bla>
xpi0t0s : <bla bla bla bla>
plupke : <bla bla bla bla bla>
xpi0t0s : <bla bla bla bla bla>

LOL

I don't think you can know your friend's MSN Version from your system, because may be that information is not shared with your MSN messenger.
In the first phase, when the user signs in, the version information of the user is sent to the host. After the user is connected to the host, you talk to him or vice versa. That's the second phase. Version information in most probably not shared in this phase.