Steps to install OpsMgr 2007 DB and Reporting on Windows Server 2008
Thought not supported in ANY way…the OpsMgr product team blog tells you how to do it…
http://blogs.technet.com/momteam/archive/2007/12/17/steps-to-install-opsmgr-2007-db-and-reporting-on-windows-server-2008-longhorn.aspx