RPC_S_UNKNOWN_IF When Calling IDataSource.SaveTo in CDOEX on Exchange 2007

We’ve been seeing some cases over the past year where customers are using CDOEX or EXOLEDB in managed code on Windows Server 2008 and Exchange 2007 and are randomly getting RPC_S_UNKNOWN_IF (0x800706B5) errors. The issue only seems to occur under load. The same code worked fine on Windows Server 2003. While we still don’t know…

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