Yes!

First, view your Address Book in your Messenger window by clicking the Address Book button (the icon with the Address Book card) at the top of your Messenger window.

Now, locate and click a person in your address book. Check it out:

Depending on their setup (or how much of their information you’ve got), you can IM them, text message them, email them, or place a computer-to-computer or computer-to-phone call.

Please Note: You must have the required information in the "Address Book" field to perform one of the above functions.