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I think I answered my own question
It seems that MSDTC is not supported by Oracle 11G R1 on Windows x64 !
All Oracle Database components are supported on Windows x64 with the following exceptions:
•Oracle Services for Microsoft Transaction Server are not supported on Windows Vista. As a result, all Oracle Windows data access drivers on Windows Vista that use Oracle Services for Microsoft Transaction Server to enlist in Microsoft Distributed Transaction Coordinator (MSDTC) coordinated transactions cannot participate in those coordinated transactions. These data access drivers include Oracle Data Provider for .NET, Oracle Provider for OLE DB, Oracle Objects for OLE, and ODBC. Check OracleMetaLink for up to date information on Oracle Services for Microsoft Transaction Server certification with Windows Vista.
Edited by: 845528 on 18 mars 2011 05:05