Microsoft has given a guarded welcome to the notion of open-source browsers yet. Speaking in Australia, CEO Steve Ballmer has not rulied out adopting such technology as an alternative to its own popular Internet Explorer, saying it is "interesting".

Ballmer, who was at a Power to Developers event, was surprised to hear a question about open source browser adoption from one of his student constituents. "Why is IE still relevant and why is it worth spending money on rendering engines when there are open source ones available that can respond to changes in web standards faster?"

"That's cheeky, but a good question, but cheeky," Ballmer said.

Ballmer began his answer philosophically, saying Microsoft will need to look at what the browser is like in the future and, if there is no innovation around them, which he thinks is "likely", Microsoft may still need its own browser because of proprietary extensions that broaden its functionality.

"There will still be a lot of proprietary innovation in the browser itself so we may need to have a rendering service," he said.

Then came the startling revelation that Microsoft may also adopt an open source browser engine.

"Open source is interesting," he said. "Apple has embraced Webkit and we may look at that, but we will continue to build extensions for IE 8."

Ballmer also admitted Microsoft got delayed with the transition from IE 6 to IE7 during the development of Longhorn, which became Vista. "But I don't want to go there."

Another question arose from the recent success of Apple's App Store and Facebook for helping independent developers make money via the host vendors application delivery mechanism. Ballmer wants to do more here for Microsoft developers.

"Making money is a good thing and with some of the competitive opportunities I don't think anyone is making any money," he said. "Some good work is being done with Facebook and the iPhone where it's easy for developers to distribute applications. It's easier to get exposure. Not much money is being made, but giving developers a way to get more visibility of their code is a good idea.

"Microsoft can do more here. We are not ready to talk about opportunities, but fear not! We are hard at work, particularly with Facebook."

Looks like Microsoft is working on a more streamlined way to bring more ISVs (emphasis on independent) into its technology stack before the are irreversibly lost to competing platforms. A well marketed application repository is the perfect way to achieve this.

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