When we started Skype, if you look at analyst reports, no one forecasted it as a big business. Also when Google started, it was not fashionable to be in search. It's not trying to do the obvious - that's the hard part.

If you can use a Web browser, you can use Skype.

We have just started, and if you compare the number of people using Skype to the number using a telephone network around the world, we're still just starting.

It is very similar to companies like Google and other internet companies. When you go and search on Google you don't pay for that. But sometimes you click on an advert and Google makes money on that.

Look for when the environment is changing - the big shift now is mobile Internet. It's really happening big-time. The way you interact with services on a smart phone compared to the Web is quite different, so there's a huge opportunity.

I try not to dwell on big mistakes but to move on when I make a mistake. I make mistakes most of the times and that's part of the risk profile being an entrepreneur. I guess one big mistake I did was not to start my own company earlier. I spent nine years working for others before starting Kazaa in 2000.