...not switch to a new version of Windows, ever, if you're seeking to avoid a learning curve. In fact, you'd best switch to Linux and KDE to avoid Metro.
Any learning curve cost of Linux - and honestly, if you're using KDE it's minimal to the point that Windows users can be tricked into believing they're still using Windows - is more than offset by the vast savings in OS costs, not to mention the added security, lack of need for constantly running antivirus software, etc. Just like any internal software or powerful niche software (CAD, CAE, ERP, etc.) the value of the software often vastly outweighs the cost of training.
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