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12 Jul 2011  


Yes, even if the old OS loses activation and is unable to start it can still be used as an inert data partition.

However I lean against keeping intact OS's for storage purposes as they can present boot problems plus derail the System boot files during a Repair if not kept marked Inactive.

If he changes the key to the new OS the old OS may well hold activation since it is on the same hardware, but this cannot be counted upon plus it is not legal under the EULA.

There is a way to delete the OS files off the partition but it requires wrestling System file ownerships so its better to gradually move data off the partition to get rid of the old OS the correct way by deleting or formatting the partition it's on.
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