Obviously, you will always see more malware targeting Android because Android is used more than any smartphone platform by a pretty substantial difference.

We're excited by the success of WhatsApp on top of Android. Amazon brings services like Kindle on top of Android. It's a competitive world and a lot more complex than people realize. When you run a platform on scale, you have to make sure it's truly open. That way, not only do you do well, so do others.

If you step back and take a holistic look, I think any reasonable person would say Android is innovating at a pretty fast pace and getting it to users.

Android was built to be very, very secure.

Android was intended to be very customizable. And we welcome innovations.

We do have business relationships; we do licensing relationships, and people want to use Google services on top of Android. But in theory, you can use Android without Google.