Windows 8

Windows 8 was released by software giant Microsoft as it sought to regain lost market share to rivals Apple and Google, whose iOS and Android operating systems dominate the smartphone and tablet markets.

Microsoft chief executive Steve Ballmer opens the Microsoft developers' conference in San Francisco. Photo: Reuters

Microsoft addresses unhappy users with new version of Windows 8

Microsoft has released a test version of its Windows 8.1 software, bringing back the “start” button and adding a host of features it hopes will appeal to users, while spurring developers into writing more applications for it.