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In order to troubleshoot a content conversion issue on a Microsoft Exchange Server 2007 server, you can enable Pipeline Tracing and Content Conversion Tracing after you install Update Rollup 4 on the Exchange server.
After you do this, a folder that is named ContentConversionTracing is created inside the path that is specified by the PipelineTracingPath parameter if Content Conversion tracing is enabled. Inside the ContentConversionTracing folder, content conversion creates the following two subfolders:
The InboundFailures folder contains the information from content conversion failures that are related to incoming messages. The OutboundFailures folder contains the information from content conversion failures that are related to outgoing messages.
For more information about Update Rollup 4 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: