Microsoft Windows® is a GUI based family of operating systems which can be used for PC’s and laptops. Windows® is typically used for computers in companies, schools and homes as it is an easy operating system to learn how to use. The are 25 main Windows® operating systems –most of which have multiple editions with extra features –which have been developed since Microsoft first released the Windows® operating system in 1985; versions include: Windows® 1.0, 3.0, 98, 2000, XP, Vista, 7, 8 and Windows® 10 (due to be released mid 2015). Windows® is one of the most commonly used operating systems around the world and is estimated to be on 80%-90% of computers.