"Yoomba does three exciting things. One is we bring all your IM contacts together. The second thing is we pioneer a new concept called email calling, where you can actually call emails. These words together may sound a little different from what we know, but your email address actually becomes like a phone number and you can simply call or receive calls on your emails. And the third thing is that it's totally free and very, very easy to use. So there is no registration. You use your regular ID, the same ID that you have. You work in all your familiar places that you're used to working. So for example, using Outlook or you're using your Web mail, it shows up there and all your contacts are available for instant open communications." Yoomba is hoping to spread in a viral fashion. Once you've installed it, if you click on a name in your address book to chat…that person gets a message to install Yoomba as well. For now…it is Windows only. There are plans to add video and other features. The goal is to make money through advertising. Bloomberg Boot Camp, I'm Fred Fishkin.