The topic says it all! It’s not possible to run multiple Yahoo Messenger at a time right after installing the official version of Yahoo Messenger. You’ll need to apply a simple patch on Yahoo Messenger to enable this feature.
Y!Multi Messenger developed by John Kirchner is the ultimate Yahoo Messenger Polygamy patch to run multiple instances of Yahoo Messenger! Perfect for those who use several Yahoo ID’s. With this you can login to as many Yahoo ID’s that you have. This will work with 8.x versions of YM.
To patch your Yahoo Messenger with Y!Multi Messenger, just follow the simple steps below:
1. Download both Y!Multi Messenger and RaveButtons.ocx at the end of this post.
2. Extract both downloaded files and place YMulti Messenger.exe together with RaveButtons.ocx and run YMulti Messenger.exe
3. Click Enable YMulti button.

4. Give it a few seconds for it to search for your Yahoo Messenger. Once found, it will auto patch. You will get a confirmation message once it’s done.
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It’s that simple!
[ Download Y!Multi Messenger ]
P/S: You will need the RaveButtons.ocx file to use this program. [ DOWNLOAD RaveButtons.ocx ]