any download or patch .
1.Go to Start ----> Run . Type regedit, then enter.
2.Navigate to HKEY_CURRENT_USER --------> Software --->yahoo ----->pager---->Test
3.On the right pane , right-click and choose new Dword value .
4.Rename it as Plural.
5.Double click and assign a decimal value of 1.
That's it done!!
Now close registry and restart yahoo messenger .For signing in with new id open another messenger
