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It's weird how the previews are free but the releases are not.
Microsoft has announced that for a limited time (1 year I believe), anyone who is currently running Windows 7, 8, 8.1 will be entitled to free, no charge upgrade to Windows 10.
They are even going to "ignore" license check. Apparently even if you've got a pirated installation, you can get it for free.
I know, I know, it's not typical Microsoft. But then again, this New CEO seems to want to get away from the legacy of crappy decisions Ballmer saddled themwith
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Sometimes a necessity - not everything works or runs satisfactorily inside a VM.
There is also significant overhead by running a VM. Even if you don't take into account that there will be performance loss inside the VM (there's always a small percentage due to overhead of the VM layers)
But you are essentially running TWO operating systems at the same time with virtualization.
This takes up valuable resources that not everyone has excess of. Especially if you're an Apple user (and no expandibility for RAM in many cases)
An example of this is running a VM on top of an OS:
OSx will take approximately 1 to 2gb of physical RAM to run.
Windows also will take approximately 1-2GB of ram to run.
running windows in a VM means you are now using anywhere from 2 to 4gb of RAM exclusively for two operating systems. Nevermind whatever programs you are attempting to also run on either the OSx or Windows side.
if you have a system with only 4gb of RAM, you are going to be limited by your performance, and the amount of things you can then run.
This is not always a suitable solution and sometimes you need those resources to be available for what you are trying to accomplish. In this case, running on bare metal is a preferred setup.
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PS If the key is the same then why don't people buy cheaper upgrade licences and use the key for the full installation?
people used to do this all the time. And windows before Win 8 would actually let you. in XP it did a check for media (asked to insert your previous Windows CD to check)
Windows 7 did away with that check, and really, you could install it fine on a brand new machine.
HOWEVER Windows 8 did something that did royally piss me off (though it is correctable via registry tweak)
During the Windows 8 installation, if you are using an upgrade, it checks the local disk for previous windows installations. if it does NOT detect one, it adds a flag to the registry, so when you go to validate online, the validation fails with the message that you have an upgrade version without a prior version installed.
I really hope Microsoft does away with this. I have purchased copies of Win7, and Win8. But if they make me install one of these prior copies before letting me upgrade to win10, thats an entire process that is wholey uneeded and actually detrimental to the clean installation process.