Skype
Skype
Skype is a freemium voice-over-IP service and instant messaging client developed by the Microsoft Skype Division. The name originally derived from “sky” and “peer”.

Skype was first released in August 2003 written by Estonian developers Ahti Heinla, Priit Kasesalu, and Jaan Tallinn, Danish Janus Friis, and Swedish Niklas Zennstom, who had also originally developed Kazaa. Skype had 663 million registered users as of the end of 2010. It was bought by Microsoft in 2011 for $8.5 billion. Microsoft’s Skype division headquarters is in Luxembourg, but most of the development team and 44% of the overall employees of the division are still situated in Tallinn and Tartu, Estonia.
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