Good Afternoon,
I recently saw that SpikeSource is using Moodle in their PHP suite for their MS Solutions on Windows Server. The suite includes Moodle, phpbb, WebCalendar, Gallery and Mantis. The info page on SpikeSource is:
http://spikesource.com/msftsolutions.html
You can also find a write up about this on the MS Open Source Community, Port25, with a PDF version at:
http://www.immagic.com/eLibrary/ARCHIVES/GENERAL/MICROSFT/M080227S.pdf
jon