Product Use Rights

The Product Use Rights (PUR) document - available from the URL below is produced 4 times a year and is designed to help you license and manage Microsoft products.

For use of any existing product, you may refer to these or any prior update to the product use rights that applied to your use of that product. Below we identify additions, deletions and other changes to the product use rights. Clarifications are also provided in response to customers’ questions. These clarifications reflect existing Microsoft licensing policies.

http://www.microsoftvolumelicensing.com/userights/PUR.aspx