RIM founders fall on their swords

[Simon]

Research in Motion founders and co-CEOs Mike Lazaridis and Jim Balsillie have resigned from their posts at the floundering BlackBerry maker.

The pair will be replaced by Thorsten Heins, who has risen quickly through the ranks since joining RIM in 2007.

The move was seen as a reaction to investor concern about the company's direction, with BlackBerry devices looking increasingly sidelined by the rise of Apple and Google in the smartphone market.

The company's problems have seen share prices plummet to an eight-year low, sparking investor unrest. The founders will, however, remain with the company, just in pared-down roles.

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