The Microsoft Volume Licensing program guides provide comprehensive descriptions of Volume Licensing programs, including information about Microsoft Software Assurance. You can download these guides to get details about things such as program features, benefits, requirements, pricing, and agreement structure.

The download page also includes a datasheet that provides an overview of Volume Licensing programs, with at-a-glance information about benefits, licensing options, pricing, Software Assurance benefits, and more.
 
You can also find this information online on the Microsoft Volume Licensing site.
 
- Andrea