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Last Updated: Friday, 20 April 2007, 09:55 GMT 10:55 UK
Blackberry mobile device
Blackberry maker RIM says an insufficiently tested software upgrade was the cause of its network failure.

A sixth executive of South Korean firm Samsung pleads guilty in the US to charges of microchip price fixing.
Ex-boss of US phone group Qwest, Joseph Nacchio, is found guilty of 19 counts of insider trading.

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