I've just found the MSN Messenger v4.6 for Windows XP! :D

I've check the links and they're working but they maybe a bit slow... Download MSN Messenger v4.6 for Windows XP english

Download MSN Messenger v4.6 for Windows XP german

or select your preferred language...

If your having any problems downloading MSN Messenger v4.6 for windows XP please update by using Microsoft download center