Apple said it worked with Microsoft to enable iPhones to receive email, contact and calendar information "pushed" from business computer networks using the US software giant's popular Office Exchange programs.

IPhones have 21 percent of the US "smart phone" market, second only to the 41 percent market-share held by BlackBerry devices make by Canadian Firm Research In Motion, according to Apple chief executive Steve Jobs.

The iPhone update will also provide secure wireless connections to business computing networks and allow owners to remotely "wipe" them clean, erasing all data from devices lost or stolen.

"We are doing all these things in the next release of iPhone software," Apple vice president of worldwide marketing Phil Schiller said while demonstrating the update at Apple's campus in Cupertino, California.

The free iPhone update will be available in June, one year after the devices debuted in the US market.

Jobs said that Apple has sold more than four million iPhones, touch-screen mobile devices combining telephone, video, music, and Internet connectivity.

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