This one is for Volume Licensing customers of Microsoft! Microsoft has released a user guide for Microsoft Volume Licensing Service Center and it is now available for download.

Microsoft Volume Licensing Service Center or VLSC User Guide offers a step-by-step help on how to register, view account details, download products, etc from the Microsoft Volume Licensing Service Center (VLSC). To streamline the process for managing multiple agreement numbers, a Windows Live ID and a valid business e-mail are required for registration. Following these steps makes the process easier for you to track and manage multiple agreement numbers.

You can download it from Microsoft here.

These guides about Volume Licensing will also interest you:

1. Volume Licensing Program Guides & FAQs from Microsoft
2. Microsoft Online Services Licensing Guide
3. Microsoft Windows Desktop Licensing – Details, FAQ, Information.