You can start a group chat in Skype with up to 600 participants at once, just by tapping or clicking the "New Chat" option.

You can Skype with up to 50 people at once on your Mac or PC in a Skype group video or audio conference.

All good things come to an end. Jeff Teper, president of collaborative apps and platforms at Microsoft, revealed in a Feb. 28 blog post that the company would be retiring the service in order to ...