Upon reading some of the recent threads and articles on WPA and licensing, I got to looking through the MSDN licensing details. Did you know that:

'You may not use your MSDN subscription as a substitute for purchasing a retail license for an operating system if you do more than develop and test on your computer.'

'...you may not install Microsoft Exchange Server on one machine and SQL Server on another—any BackOffice Server components you require must be installed on only one machine. '

You may not use a MSDN operating system to stress test if you need to test with more than 10 users/connections? For this you need to buy a retail OS license...