Microsoft has published a set of Volume Licensing Program Guides, Data-sheets, and FAQs and are now available as a download.
Microsoft Volume Licensing Program Guides
The Microsoft Volume Licensing program guides provide comprehensive descriptions of Volume Licensing programs, including information about Microsoft Software Assurance. Download these guides to get details about things such as program features, benefits, requirements, pricing, and agreement structure.
Get to know the basics and learn how Volume Licensing works and why it makes sense if you need more than five software licenses.
The datasheets provide an overview of Volume Licensing programs. Use these documents to get at-a-glance information about benefits, licensing options, pricing, Software Assurance benefits, and more.
Also check out Microsoft Volume Licensing Service Center User Guide.