Although Apple has just licensed Microsoft Exchange ActiveSync for the iPhone, it might be a while before the software giant's Silverlight plug-in follows.
Microsoft CEO Steve Ballmer has reiterated at MIX 08 how keen his company is to spread Silverlight technology, which allows developers to build and deliver multimedia applications on the web and is a rival to Adobe Flash. He also describes putting it on the iPhone as "interesting".
However, Ballmer said there had been no extensive discussion with Apple CEO Steve Jobs about a Silverlight-iPhone tie-up.
In response to an audience question, he also expressed concern about Apple's recent plan to let developers sell applications for the iPhone on iTunes and take a 30 percent cut of revenues.
Ballmer suggested that Apple might charge Microsoft similarly to get Silverlight on the iPhone, though there is so far no evidence to support this belief.
"It sure seems like they're trying to charge a whole lot more money for it," he said. "Maybe Apple isn't welcoming open and royalty-free runtimes on it."