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A manager in the Microsoft Open Source Software Lab told me that XOOPS is one of the applications they use to benchmark the performance of the Windows implementations of PHP and MySQL.
They're also interested in seeing XOOPS support MS SQL Server, in addition to MySQL, and they offered to help with that.
The purpose of the summit, in my opinion, was to aid their strategy of encouraging the development and use of open source software on Windows (which means increased sales of Windows).
http://microsoft.com/opensource/