Windows 10 = Windows 8.10
Windows 10 is little more than Windows 8.10, and the primary purpose of Windows 8.10 has almost nothing to do with the needs of actual PC users, but again, just like Windows 8.x, is all about what Microsoft wants in an OS, which appears (once again) to be oriented towards mobile, a market Microsoft lost years ago and will never gain back, given that their current worldwide smartphone share is less than 3% and shrinking.
Just as with Windows 8.x, almost no enterprise, SMB, government or industrial users will abandon Windows 7, many of whom just converted from Windows XP.
And just like Windows 8.x, mostly it will be hapless consumers who buy their PCs at retail stores like Best Buy who will be stuck with Windows 8.10. That is, those few consumer Windows PC users who haven't already permanently fled Microsoft because of Windows 8.x.
No one in industry, manufacturing, government, military, business, or the enterprise will care one whit about Windows 10 unless it's a more productive operating system for the vast majority of their PC users.
That really will be the sole metric of the success of Windows 10: is it compatible with the hundreds of millions of current PC applications and users, and is it substantially more productive than Windows 7? If not, then there's no business case for "upgrading" from Windows 7 as there will be no positive return on investment.
PC productivity should have been Microsoft's primary focus for Windows 10. However, Microsoft has persisted in making an operating system that meets Microsoft's needs and not the needs of its industrial and business users. As a consequence, Windows 10 will be another flop like Windows 8, and never before has Microsoft had two major OS flops in a row. Now that Microsoft has all but lost the war for mobile, they can't afford to lose their one remaining monopoly.
The bottom line is that Microsoft is facing a headwind of skepticism (and alternatives) like never before in their history of introducing new operating systems, and I wonder if they know that Windows 10 is not just another OS to be introduced to a naive and adoring audience with their typically lame publicity barrage, but may be in fact be the last OS they ever introduce that anyone will actually give a hoot about if turns out to be as bad a bomb as Windows 8.xxx.
Microsoft's top task should be maintaining it's near-monopoly on the desktop in the enterprise world, and windows 10 is no more capable of doing that than windows 8 was. Microsoft's exclusive focus with W10 has been on mobile, a war it already lost nearly a decade ago when it didn't even know it was in a battle.
Therefore there is no compelling reason to change from W7 TO W10 on PCs, and W10 won't significantly advance Microsoft's currently 3% and shrinking worldwide smartphone market share.
I’m just now converting the majority of my business clients from XP to W7. I’ll keep them on W7 if/until MS produces something that is compatible with the hundreds of millions of current PC applications and user interfaces, and is substantially more productive for their users than Windows 7. Should that case not arise from MS, then there’s no business case for “upgrading” from Windows 7, even if it is "free", as there will be no positive investment return from the costs of the change.
And based on working extensively with W10 TP releases, I can tell you W10 is NOT better than W7. W10 is nothing but a gussied up W8.x with nothing new in it that’s needed on enterprise or SMB PCs. There’s nothing new in W10 that’s not being put there solely to foster MS’s vain hope of growing their currently shrinking 3% worldwide smartphone market share. Cortana, Spartan, APIs for universal device applications, slightly improved (but still bereft) MS App Store, integrated MS cloud, integrated MS Bing, and all the rest are things for cell phones and/or things MS wants to try to trick people into paying extra money for. And not a single one of these things is truly useful for enterprise and SMB PCs.
Fundamentally, W10 is what Microsoft management is selling to its ignorant board of directors as the great mobile savior that will make Microsoft relevant in mobile. The problem is that Microsoft will never be relevant in mobile. That war was fought and lost years ago before Microsoft even understood they were in a battle, much less in a war for survival. W10's sole purpose is really to keep the post-Ballmerites in their jobs for the few years that it will take the board to realize that the post-Ballmerites are equally as clueless and impotent as the recently departed Ballmerites.
Before it was released to the public, I predicted W8.x was going to be a massive disaster for both Microsoft and the entire PC industry, and I predict that W10 will be little better. W10 is going to be almost as big a bomb on the PC for MS as was W8.x.