Microsoft and Novell on Wednesday swung open the doors on their Windows/Linux interoperability lab and said its initial focus will be around three projects involving virtualization, management and identity federation.

The Microsoft and Novell Interoperability Lab in Cambridge, Mass. is the by-product of the vendors’ five-year partnership launched in November 2006 that promised interoperability between their platforms. The partnership also included a cross-patent licensing deal that raised the ire of many in the open source community.

The 2,500-square-foot research lab near the campus of the Massachusetts Institute of Technology is staffed with five test engineers whose ranks are slated to expand to eight.

Tom Hanrahan, hired by Microsoft in June, will represent the Windows side of the agreement as Microsoft’s director of Linux interoperability. He was most recently the director of engineering at the Linux Foundation.

Suzanne Forsberg, senior manager of software engineering and open platform solutions for Novell, will represent the Linux interests. Forsberg previously was the software director for Egenera, which develops a data center virtualization system.

The two are starting with three projects with the first being focused on virtualization.

The companies will ensure that SUSE Linux Enterprise Server (SLES) and Windows Server 2008 will run as guest operating systems on both the Microsoft and Novell hypervisor. In addition, the work will ensure that SLES runs on top of Windows Server Virtualization in a paravirtualized mode, which means the guest operating system is modified to work more closely with the underlying hardware and not just with the virtualized environment. Also, the two will make sure Windows Server 2008 runs in enlightened mode on top of Novell’s Xen hypervisor. Enlightened mode is a Microsoft technology that allows the server to recognize when it is running on top of a hypervisor and then automatically take different avenues to access memory management and IO.

The second lab project will center on interoperability between Novell’s ZenWorks management suite and Microsoft’s System Center family of products to ensure those tools will work in environments where both operating systems are virtualized.