Microsoft launches Windows 8 upgrade

Microsoft has debuted an upgrade to its Windows 8 operating system during the Microsoft Build Conference in San Francisco
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Microsoft CEO Steve Ballmer holds two Windows phones as he speaks during the keynote address during the Microsoft Build Conference on June 26, 2013 in San Francisco, California. Microsoft debuted an upgrade to their Windows 8 operating system during the Microsoft Build Conference that runs through June 28. (Getty Images)
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Microsoft CEO Steve Ballmer looks at a display of Windows phones as he speaks during the keynote address during the Microsoft Build Conference on June 26, 2013 in San Francisco, California. Microsoft debuted an upgrade to their Windows 8 operating system during the Microsoft Build Conference that runs through June 28. (Getty Images)
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Microsoft CEO Steve Ballmer speaks during the keynote address during the Microsoft Build Conference on June 26, 2013 in San Francisco, California. Microsoft debuted an upgrade to their Windows 8 operating system during the Microsoft Build Conference that runs through June 28. (Getty Images)
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Attendees look at products during the Microsoft Build Conference on June 26, 2013 in San Francisco, California. Microsoft debuted an upgrade to their Windows 8 operating system during the Microsoft Build Conference that runs through June 28. (Getty Images)
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Attendees look at products during the Microsoft Build Conference on June 26, 2013 in San Francisco, California. Microsoft debuted an upgrade to their Windows 8 operating system during the Microsoft Build Conference that runs through June 28. (Getty Images)
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Attendees look at products during the Microsoft Build Conference on June 26, 2013 in San Francisco, California. Microsoft debuted an upgrade to their Windows 8 operating system during the Microsoft Build Conference that runs through June 28. (Getty Images)