kopete 0.7.3 works fine on suse 9.0 with these modifications
edit your /home/<user>/.kde/config/kopeterc file and modify the PluginData_MSNProtocol_serial=0 and add in the [MSN] section UserAgent=0x0409 winnt 5.1 i386 MSNMSGR 5.0.0 MSMSGS
that's all that I did to make Kopete works with MSN.