Skype is software now owned by Microsoft that allows one to send Instant Messages, make Voice Calls, and have Video Chats with anyone else using Skype on their computers or mobile devices anywhere n the world. At peak times of the day Microsoft claims as many as 30,000,000 users are online using Skype! Skype was founded in 2003, and while a division of Microsoft, they are headquartered in Luxembourg. Supported devices include computers running Windows, Mac OS X, and Linux, iOS devices (iPad, iPod Touch, and iPhone), and devices running Android. Got questions about any of Microsoft's other software or gadgets? We've got answers: Text 542542 (costs $1.49 plus any standard messaging charges from your carrier).