If you have purchased the product from an authorized reseller of Microsoft software, the product-key was included. If it was not included, go back to the reseller, and get the product-key from them, or get a refund.
If you have a "bootleg" copy, then you need to buy an "authentic" copy of the software.
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If you have purchased the product from an authorized reseller of Microsoft software, the product-key was included. If it was not included, go back to the reseller, and get the product-key from them, or get a refund.
If you have a "bootleg" copy, then you need to buy an "authentic" copy of the software.