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When implemented by a derived class, converts an item ID to the FeedSync format.
HRESULT ConvertItemIdToString( const BYTE * pbItemId, IFeedIdConverterCallback * pCallback);
[in] The item ID in the provider format.
[in] The IFeedIdConverterCallback::ConvertItemIdToStringComplete method of this object is called to return the converted item ID.
S_OK
User-defined error codes