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Skype released an updated version 5.3 for Mac OS X Lion and HD video calls, Skype 5.3 also works with every version of Apple’s operating system going back to Leopard. With Skype 5.3 for Mac OS X, you’ll also be able to send and receive HD quality video when talking to your friends and family. Video calling works with the Mac’s built-in webcam or add-on like Logitech C910 cams with recommends speed of Internet connection of at least 1.5Mbps for receive clear HD video calls.
Download Skype 5.3 from
http://www.skype.com/intl/en-us/get-skype/on-your-computer/macosx/