Windows 10: Lost product key and new motherboard

My last motherboard died on me and I got a new motherboard I plan to install with my old SSD on it with windows. I intend to install a fresh copy but don't have my product key. How would I go about obtaining that key before I attempt to install anything? Thanks for any help.

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Lost Product Key & motherboard has been replaced

I lost my product key to a laptop that the motherboard has also been replaced.

where & how can i find my product key and how can i activate my windows 10?

I have all the digits of the key except the 5 digits.

Please help

 

Lost of Product Key

I bought my Laptop in July 2015 with the Home and Student Microsoft Word. When I refreshed my computer I lost the Product key and I could not find the CD that contain the product key. What shall I do please suggest and help.

 

Lost of Product Key

Hi,

Thank you for posting your query in Microsoft Community.

• Which operating system was installed in the computer when you bought it?
• Did you receive CD of the operating system when you bought the laptop or Windows was already installed?

If you upgrade to Windows 10 from Windows 7 or Windows 8.1, you won’t receive a Windows 10 product key. Instead, Windows 10 will be activated using a digital entitlement.

The Product Key on a computer that has Windows 8 pre-installed is embedded in the BIOS on the motherboard. There is no longer any sticker with the product key.

How to find your product key depends on how you bought your copy of Windows (if Windows 10):

• 
  If you bought Windows 10 from an authorized retailer, the product key will be on a label inside the box it came in.
  
• 
  If you bought a digital copy of Windows 10 from a Microsoft website, the product key will be in the confirmation email you received after buying it or will be distributed digitally as an entitlement, in which case you won't receive a product
  key. For example, if you upgraded to Windows 10 for free, you'll receive an entitlement instead of a product key.
  
• 
  If you bought a new PC running Windows 10, the product key will be pre–installed on your PC and your PC will automatically be activated, included with the packaging the PC came in, or included on the Certificate of Authenticity (COA) attached
  to the PC.
  

Hope this information is helpful. Please feel free to reply in case you face any other issues with Windows in future.