Microsoft on Tuesday released Skype Qik, a new mobile chat app that features short, self-destructing video messages that automatically self-destruct in two weeks -- or sooner if set to do so. Skype need not be installed on a mobile to use Qik, which runs on Android, iOS and Windows phones and is available for free from the Google Play, the iTunes App Store and the Windows Phone Store. With Skype Qik, Microsoft aims to capture some of the audience for lightweight communication apps such as SnapChat, WhatsApp and WeChat.