O.P. Vertical tabs !!
We have been forced to upgrade to Windows Live messenger 2011.
This version supports tabs by itself, and for this reason, Messenger plus! has disabled its tab options.
But the tab option from WLM 2011 is far from good.
It is only possible to have horizontal tabs which is NOT convenient when you're talking to many people at the same time.
While Messenger plus has had the vertical tab option for years!
I want vertical tabs back !
It is very stupid from microsoft not to have allowed it.