http://www.news.com/8301-13860_3-9886332-56.html
"Microsoft researcher Steve Ickman said while the company's internal SharePoint site is great for some uses, there are some features that the Wikipedia engine has that are missing in Microsoft's product. One big thing is the engine's ability to archive. On the SharePoint site, typically only the current status of a project is shown."
Definitely MediaWiki - there's a photo.
So expect our Windows performance to significantly improve, then ;-D
(Mind you, Zend PHP has apparently had a speedup too - http://www.itnews.com.au/News/71347,php-optimised-for-windows-server-2008.as... )
- d.