It's extremely hard to build a company with a product that everyone loves, is free and has no business model, and then to innovate a business model. I did that with Kazaa, had half a billion downloads but that wasn't a sustainable business.

We have 2 million users in the U.S. and about 13 million worldwide in more than 200 countries. We're getting 80,000 new users each day. And more than half a million people are connected via Skype at any given moment.

Then people started using it more and more and it became the most downloaded software on the internet.

We also have a conference call feature where up to five people can talk on one Skype call.

I hope that my investment into Atomico will become my best financial investment to date.

If you want to be an entrepreneur, it's not a job, it's a lifestyle. It defines you. Forget about vacations, about going home at 6 pm - last thing at night you'll send emails, first thing in the morning you'll read emails, and you'll wake up in the middle of the night. But it's hugely rewarding as you're fulfilling something for yourself.

You have 1 billion people using the Internet with 200 million of those now using broadband internet connections, so the Internet has become a powerful network. It can carry calls.