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I came to know that many people buying more than one product key for Windows 8. What's the use of getting more Keys? Suppose If I purchase only one product key, OS available for limited time or Life time?

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You need one key per pc you own. – Ramhound Oct 31 '12 at 15:45
If you want the media center pack add on, you will need a key for that, get one for free here-limited time offer – Moab Oct 31 '12 at 16:33
They might be buying more that one because Microsoft is discounting the price for a while, some may be stocking up while it is cheap. – Moab Oct 31 '12 at 16:33
up vote 2 down vote accepted

The OS is available for a lifetime. If you are a normal user then 1 key per computer you own will be enough for daily use. But for IT departments they require more than 1 as they have to install Windows 8 for the corporation. (Meaning at least 100 computers need their own key)

If you want the Media Center pack add on for Windows 8 Pro, you will need a key for that, get one for free here-limited time offer

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If you have 100 computers, volume licensing (VLK/MAK/KMS) is the way to go, not individual retail version keys. – Karan Oct 31 '12 at 18:44

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