Microsoft wants to get coders in to help get Firefox and Thunderbird working on Vista.   As in actually inviting them into their offices, and helping them work with the new Vista kernel and API. 
“MICROSOFT HAS promised to help Firefox and Thunderbird coders get their open source programs working on Vista.

The head of Microsoft’s open source software lab Sam Ramji said that Vole had approached Mozilla to if it’s interested in making sure the Firefox browser and Thunderbird e-mail client run under Windows Vista.

Ramji said he had set aside office space for open-source developers and would make Microsoft engineers available to Firefox and Thunderbird coders.”

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