RT @wfvanvalkenburg Besturingssystemen die #tudelft Blackboard bezoeken: http://bit.ly/7MQQjE (Vista 30%, XP 48%, Mac 12%, Windows 7 10%)
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RT @wfvanvalkenburg Besturingssystemen die #tudelft Blackboard bezoeken: http://bit.ly/7MQQjE (Vista 30%, XP 48%, Mac 12%, Windows 7 10%)