Windows 8 marks what is arguably the most radical tech launch of the year. Microsoft aims to leapfrog the competition by offering a touch-based, dynamic, futuristic-looking interface which can run on processors designed for both high-spec computers, and chips more commonly associated with smartphones. Its market-leading status is at stake. More than 1.5 billion devices currently use a version of Windows, making it by far the most installed operating system, according to tech research firm Gartner.
But investors are more concerned about the firm's growth prospects amidst growing competition for customers' cash. "We think the industry changed with the iPad launch because the tablet is effectively a PC - it doesn't need to be connected to a network to work and runs third-party applications," Steve Brazier, chief executive of research firm Canalys, says. "Once you segment the market that way, Windows share of the global PC market has fallen to 72%. Three years ago that would have been over 95%. "If you add the PC market together to the smartphone market - which we call the intelligent device sector - Windows share falls to 32%."
Windows 8 and its close relation Windows Phone 8 are designed to reverse that trend. One thing is certain: Microsoft's efforts will have industry-wide ramifications. A study by Gartner indicates worldwide PC shipments were 8.3% lower than the previous year in the July-to-September quarter. That spells trouble for companies including HP, Dell and Acer which have seen sales decline as a consequence. A successful launch might recharge demand, but first they must face the prospect of a challenge from Microsoft's own tablet, Surface. The BBC asked a selection of industry experts for their views of Microsoft's new products:
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