RIM shaken by iMessage as stocks tumble

BlackBerry maker RIM's stocks fell to a four-year low yesterday after the announcement of Apple's iMessage. It seems that investors have got the jitters as Apple nabs yet another key BlackBerry USP; iMessage is an instant messaging service for Apple devices on iOS 5, just as BlackBerry Messenger is for BlackBerry users. On Tuesday, RIM's stock fell to below $37 for the first time since 2007, a tumble of around 3 per cent. Grim RIMWhat's more, over the course of this year RIM's stock has fallen

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