In an effort to compete better with Google Hangouts, Microsoft’s Skype has made group video calling — previously available only to Skype Premium subscribers — free for all Mac, Windows, and Xbox One users, with support for more platforms slated for the future. In our use, Skype’s quality and reliability has suffered over the past few years, and while Google Hangouts has a lousy user experience for starting and joining calls, it is far more stable than Skype once you get going. follow link
Find Your Mac's Serial Number
Want to check your Mac's serial number quickly and easily? Select About This Mac from the Apple menu, and click on the text directly below "Mac OS X" that reads "Version 10.x.x." Click once and you'll get a build number which is more specific information about the software. Click twice, and you'll get your Mac's serial number.
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Skype Makes Group Video Calling Free