Y!Multi Messenger 8.x and 9.x, the latest version, is a free software program designed to run multiple Yahoo! Messenger instances . If you meet issues with Yahoo Multimessenger instalation then try version 8.x, that works on all versions of Yahoo Messenger. Just lounch Y!Multi Messenger.exe file, select enabling/disabling polygamy patch. Download free the latest version of Yahoo Multimessenger from here!