Microsoft gave the first look at its Windows 10 operating system on Tuesday, a major release that will span all hardware from PCs to phones and try to address the ills that have dogged 
Windows 8.
The event in San Francisco was aimed mostly at enterprise customers, and Microsoft promised an OS that will be more intuitive for the millions of workers still on Windows 7 and older OSes. Here’s a rundown of some of the key points we learned Tuesday about Windows 10.
Why Windows 10?
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