JSI Tip 6250. Microsoft® Software Inventory Analyzer (MSIA).

http://www.microsoft.com/piracy/msia/ contains:

Welcome to the Microsoft® Software Inventory Analyzer (MSIA). Using this tool, you can generate an inventory of core Microsoft products installed on your local machine, or on the machines throughout a network.

Please see the options at the left for more information on MSIA, including the step-by-step guide which will detail each step of the program. You can download MSIA by clicking here or on the button above.After installing MSIA on a workstation in a test domain, I ran a network analysis. Here is an example of the Summary page of the the MSIA report: