Already you know that Skype is one of popular application for Instant messaging, Voice call and Video calling over the Internet. As of Sept 2011 it has more than 600 million registered user, it is available for all operating system such as Windows,Mac,Linux and android too. When you are downloading the Skype for Mac or Linux, it download as the offline installation(~ 20MB) package according to their operating system. But when you are downloading Skype for Windows, it download as the online installer (~ 1MB) for installing Skype and it requires Internet connection for completing the installation. Whenever you are reinstalling or fresh installation of Skype requires Internet connection and it consumes the bandwidth of your Internet, full installer will be the best one for installing Skype every time.