These are often MSDN or Volume Licenses intended for businesses. Microsoft can deactivate these keys at any time if they detect they were resold against their Terms of Service.

If you are a student or have a .edu email, you can often get this for free or at a massive discount.

If you absolutely must have the 2010 version for a specific legacy workflow:

Microsoft will not provide assistance for installation or activation issues. 🔑 The "Cheap" Key Market

Use Word, Excel, and PowerPoint for free in a web browser via Office.com.

Error: Please enter a valid email address

Error: Invalid email

Error: Please enter your first name

Error: Please enter your last name

Error: Please enter a username

Error: Please enter a password

Error: Please confirm your password

Error: Password and password confirmation do not match