Omega Messenger is a multiplatform instant messenger program which supports the four main instant messenger networks : MSN Messenger, Yahoo! Messenger, AIM and ICQ, so you will be able to have all of them together.
As you avoid to have four different programs running at the same time, you'll save a lot of resources and your computer will run faster.
Finally we have to say that it doesn't offer all the features you can enjoy if you run the programs of each instant messenger net.
You can quit the ads if you pay a little amount, but you'll enjoy the same features if you don't pay.