Difference between Microsoft Office Retail and Bind Keys

RETAIL licenses:
These are the standard consumer licenses for Windows or Office. They have been designed for normal computer users, who intend to purchase a license to upgrade their machine to a new version of Windows. This type of license allows the user to install Windows on any
computer and even change it to another, but the same license can only be installed on a single computer at a time.

BINDABLE licenses:
These licenses have all the features of the RETAIL version but additionally provides the option to bind the license to your Microsoft account which will allow you to perform
unlimited reinstallations even on a different PC as long as there is only one active installation.