Windows 7 was released in 2009. It sold over 100 million copies in six months and remains hugely popular. More stable than predecessor Windows Vista and more familiar than its radically redesigned successor Windows 8, version 7 is still estimated to be running half of the world's PCs.
Windows 10 release date - January 21, 2015
The next generation of Microsoft's venerable operating system is Windows 10 -- they're skipping 9, for some reason
Why Windows 10?
The natural name would have been Windows 9, but Microsoft is eager to suggest a break with the past. “We’re not building an incremental product,” said Terry Myerson, head of Microsoft’s Operating Systems Group.
Microsoft considered the name “Windows One,” he said, to match products like OneNote and OneDrive and its “One Microsoft” business strategy. But he noted the name was snagged a long time ago, by a young Bill Gates.
Some users have been confused by the Windows 8 interface and can’t figure out what’s open on their screen or how to get back to an app. Windows 10 has a feature like OS X’s Mission Control that lets you zoom out and see everything that’s open on a PC, then select any app to enter it.
There is, and it tries to combine the familiarity of Windows 7 with the modern interface of Windows 8. That means the menu is split: On the left, apps are displayed in the familiar Windows 7 style, while on the right are more colorful “live tiles” that open the modern, Windows 8-style apps.
Microsoft isn’t saying anything about prices yet, or any incentive programs to get people to upgrade from older OSes.
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