Depends on how you bought it. Here are some images:
How to identify, locate, and replace a product key -http://support.microsoft.com/kb/811224
How to identify the product key
Microsoft product keys contain 25 characters that are typically divided into groups of 5.
Where to locate the product key
The product key is typically located on an orange or yellow sticker on the back of the CD case or the DVD case. If the Windows operating system that you are using was preinstalled by your computer manufacturer, you may find the Windows product key sticker on the computer. To find the product key for a full version, check the following locations:
·Sticker on the CD case or other packaging.
·Certificate of Authenticity.
·Confirmation e-mail message that was received from an online purchase.
·Retail perpetual product key, located inside the new Product Key Card available at retail stores.
·Retail perpetual product key, purchased online from Office Online (http://office.microsoft.com) with the full download of Office.
If you still cannot find the product key for your full version,
Make sure that you store the product key together with the product CD or DVD in a safe location in case you have to reinstall the product in the future. The product cannot be reinstalled without both the product key and the CD or DVD.
Product keys are specific to their software products. For example, you cannot use a Windows product key to unlock a Microsoft Office product.
2007 Microsoft Office Suites License Designations - 2007 Product key images -https://office.microsoft.com/en-us/products/2007-microsoft-office-suites-license-designations-HA101819164.aspx
Microsoft Office 2010 Product Key and license Photo– How to find them? -http://techblissonline.com/microsoft-office-2010-product-key-and-license/
What is a Windows Certificate of Authenticity (COA)? - How to Tell What Win and Office COA look like PHOTO-http://www.microsoft.com/howtotell/content.aspx?pg=coa&displaylang=en
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