I expect Microsoft to release an OP called WAAD - Windows Azure Active Directory Server soon: http://www.gluu.co/waad-interop
Are you sure you need an OpenID provider? If you need the Relying Party code, I recently saw this quick article: http://www.gluu.co/simple-connect-client
If you really need an OP, perhaps you should consider OX: http://ox.gluu.org
Who really cares what language the OP is written in? What you want is an easy way to administer things ... and OX provides an excellent web-based management interface (oxTrust).
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