Anyone knows what's going to happen to us who have installed w10 preview.
As gareth has said, if you installed it over a Windows 7 or 8 install using Windows Update it will automatically update to the final version on release. Microsoft have confirmed this.
If you have installed a preview from a clean install it will require a clean install of Windows 10 (presumably because it doesn't have any CD key in it to update to 10). Again this is from Microsoft.
I'm not too sure I'm that keen tbh, I didn't realise it was an automatic update...
What if your current 7/8 install is a bit flaky, the 10 install will inherit all of that won't it
I'd much prefer to do a fresh install.
You will be able to do a fresh install. Microsoft have confirmed that Windows 7 users without SP1 and Windows 8.0 users will get the free upgrade, but won't be able to use the little app that's started popping up. They will need to do a clean install from an ISO which will be available upon release.
Also as with Glaucus' comment above, those of us with Windows 7 or 8.x keys not in use because we have installed Windows 10 Preview from an ISO will still be able to upgrade our 7 or 8.x licenses to 10, but will need to use an ISO.
So will OEM versions be valid for the free upgrade?
Yes.
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