In a recent Press Release, Microsoft announced its plan to expand interoperability.
Source:
http://www.microsoft.com/presspass/press/2008/feb08/02-21ExpandInteroper... [2]
It now seems that MS is sticking to the plan and has initiated discussions w/ the Eclipse and Apache Foundation.
Source:
http://www.eweek.com/c/a/Windows/Microsoft-Claims-to-Support-Open-Standa... [3]
Links:
[1] http://pulse.veltsos.com/category/it/software/software/os/microsoft
[2] http://www.microsoft.com/presspass/press/2008/feb08/02-21ExpandInteroperabilityPR.mspx
[3] http://www.eweek.com/c/a/Windows/Microsoft-Claims-to-Support-Open-Standards-and-Interoperability/