MOGI is the Mono OpenGroupware Interface. MOGI provides a modular .NET interface to functionality provided by the OpenGroupware groupware server.
MOGI currently only provides a working connector for 'RPC2', the OpenGroupware ogo-xmlrpcd daemon's XML-RPC API. A connector for GroupDAV and zOGI is possible, but no work has been done.
If you are currently developing a client for OpenGroupware I recommend you consider using the newer zOGI XML-RPC API which is included in ZideStore since 2007-08-19 (r1994). If you need to access that API from a .NET environment an assembly for that purpose is included in the Consonance project; at some point that assembly will be broken out into a stand-alone project.