Users connecting to the Microsoft Connect site, the repository of beta programs replacing the old Betaplace, and checking available programs will see a new beta available for enrollment since end of March: Virtual Machine Additions for Linux.

As reported:

Virtual Machine Additions for Linux can be installed in qualified Linux operating systems when running as guests in Virtual Server 2005 R2.

Supported operating systems actually are:

• Novell’s SuSE Linux Enterprise Server 9
• Novell’s SuSE Linux 9.2
• Novell’s SuSE Linux 9.3
• Novell’s SuSE Linux 10.0
• Red Hat Enterprise Linux 2.1 (update 6)
• Red Hat Enterprise Linux 3 (update 6)
• Red Hat Enterprise Linux 4
• Red Hat Linux 7.3
• Red Hat Linux 9.0

Check the related Knowledge Base article for updates.

Microsoft states that customers who report interoperability issues with Linux guests or virtual machine add-ins will be routed to a team that is specially trained to troubleshoot issues related to Linux guests within Virtual Server 2005 R2.