: Websites like eBay or specialized software discount sites often sell "surplus" keys. These are frequently Volume Licensing (MAK/KMS) keys or OEM keys intended for specific hardware, which may violate Microsoft's Terms of Service if sold individually.
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: Often the most common source for physical "Product Key Cards" (PKC) or discs with keys. Look for sellers with high ratings and original physical packaging to increase the chance of getting a genuine, one-time-use key. : Websites like eBay or specialized software discount
: Some vendors sell digital-only keys. Ensure the site offers a money-back guarantee if the key fails to activate, as these are often "scrapped" from old machines. buy microsoft office 2010 product key