The director of Microsoft's open source lab has invited the Mozilla development team to come to Redmond and participate in a Vista porting lab. Microsoft is interested in helping the team make sure Firefox and Thunderbird will work properly on Vista. To date, Microsoft has invited commercial software makers and large corporate customers to these kinds of labs. If the Mozilla folks participate, it will be the first time an open-source venture took part in a Windows porting lab of this nature, it seems.