Tablets, Ipads, Smartphones will NEVER replace the PC desktop or laptop for getting serious work done, they're convenient and fun little toys but unless you're a lilliputian keyboard and screen sizes designed for humans-and average human visual acuity-will remain approximately the same. I can type 80wpm on a regular keyboard. Maybe 5wpm on a smartphone. Which, then, do you think my employer will expect me to use?
Now Windows 8 (like Ubuntu's disaster known as Unity) is designed for pads and smartphones, not pc's. The interface is not intuitive and requires more work/keystrokes/touches to get the same work done as previous guis. How's that going to impact productivity? Need an app for Windows 8? Forget about any of the software you've paid hundreds or thousands of dollars for. None of it will run under Windows 8. Nothing. Your only source of software? The new Microsoft App store. Programs must be written specifically for Windows 8, approved by Microsoft, and sold at the M$ app store. Expect Microsoft to drop support for their best OS ever (XP), as well as the turkeys known as Vista and 7. Businesses and individuals will be forced to seek alternatives (apple, linux) and Microsoft will die.
Wait for it.
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