Shoutbox

To check your WLM version:
In Main window (the Contact List window), press Alt. As the menu shows, select Help, and About Messenger. You'll see your Messenger's version in the window that pops up then.

The option of simutaneous log-ins is in "General" section (the first section) of the "Customize!" tab (the right-most tab) of Plus! preferences. It reads "Allow me to connect to several accounts simutaneously".