Push has a long been a key feature of the BlackBerry devices coveted by corporate users because it automatically brings users new e-mail and calendar updates without needing to manually check for them.

Previously, Google (NASDAQ: GOOG) only offered push e-mail for the BlackBerry and for devices built on the open source Android operating system, on which Google leads development. Now, users of the Apple (NASDAQ: AAPL) iPhone and iPod Touch and of devices based on Microsoft's (NASDAQ: MSFT) Windows Mobile will similarly benefit, Google said.

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