I have two more mirrors for you guys:
Bellsouth:
http://bellsouthpwp.net/I/n/Insom/MsgPlus.rar
(Had to put it into rar; bellsouth wont accept .exe files but its fast...holy shit that compressed well!)
Angelfire:
http://www.angelfire.com/pro/geninsom2/MsgPlus.exe