Open source fans are buzzing about Microsoft’s latest move to open its APIs, which follows along the path it has been on recently. Microsoft’s announced intention to open APIs to its Vista, .Net, Windows Server 2008, SQL Server 2008, Office 2007, Exchange and Sharepoint software is no-doubt big, but it also comes as more and more traditional software and even hardware vendors tailor their strategies to address the pervasiveness of open source software in the enterprise.