RIM’s Rival to IPad Wins Fans as Clients Seek Security

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Research In Motion Ltd.’s BlackBerry PlayBook, the tablet designed to compete with the iPad from Steve Jobs’s Apple Inc., is winning corporate customers months before its debut.

Insurer Sun Life Financial Inc. has agreed to buy as many as 1,000 PlayBooks, and the Canadian banking unit of ING Groep NV says it is also committed to purchasing the device. Companies including Manulife Financial Corp. are testing the product, set to go on sale next quarter.