Multiple Activation Key (MAK) - denotes the product key used when installing software licensed in bulk, which allows a single product key to be used for multiple installations. This means you Only Need to Buy One Key to activate more than one machine.

How volume licensing works
http://www.microsoft.com/en-us/Licensing/licensing-programs/how-volume-licensing-works.aspx


Microsoft Windows
Microsoft Windows 7 Pro (Multiple Activation Key) - $2
Microsoft Windows 8.1 Pro (Multiple Activation Key) - $2

Microsoft Office
Microsoft Office 2010 Standard (Multiple Activation Key) - $2
Microsoft Office 2010 Pro (Multiple Activation Key) - $2

Autobuy:
https://payivy.com/u/f8fbd


- Apply to 32 and 64 bit Windows.
- Apply to Windows of all languages.
- Please do not buy more than one key as it can activate multiple machines.
- The keys are not retail key, they are legit and were acquired through volume-licensing programs of Microsoft.
- Paypal only.