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Not sure why this happened. I saw that problem before. Maybe it's caused by MS Outlook and exchange on the same machine. My walk around is using IDataSource Open a new connection:         pDsrc->Open(                 bstrURLItem,                 NULL,                 adModeRead,                 adFailIfNotExists,                 adOpenSource,                 bstr_t(),                 bstr_t()                 );

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