Microsoft announces three versions of Windows 8

Brandon le Blanc, head of communications at Windows, announced the versions on the official Microsoft blog. He wrote: "We have worked to make it easier for customers to know what edition will work best for them." Windows 8 will come in three versions: Windows 8, for home PCs and laptops, Windows 8 Pro, for enthusiasts and professionals, and Windows RT, for devices running low-power Arm processors, such as tablet devices and lightweight ultrabooks.

Windows RT is the first version of Windows designed with tablets in mind, and indicates Microsoft's commitment to moving into touchscreen devices. It will come pre-installed on computers and tablets powered by Arm processors and will include a touchscreen-based version of Microsoft Office as standard. British company Arm own the licence for most of the processors used in tablets and mobiles, although Intel is also aiming to enter the space.

Windows 8 is the standard, consumer-based model which will be run on most new home computers, while Windows 8 Pro will include extra features such as file encyption, virtualisation of operating systems and domain management. The announcement of three editions indicates a simplified approach from Microsoft, which released five different versions of its previous operating system, Windows 7.

Le Blanc wrote: "Windows 8 has all the flexibility you need. You can use a touchscreen or a keyboard and mouse - and switch anytime. Its beautiful, fast and fluid design is perfect for a wide range of hardware."

Microsoft is keen to make an impression in mobile devices, having revamped its mobile phone operating system last year. Nokia and Dell are rumoured to be releasing Windows 8 tablets this year.

The telegraph