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Called by IFeedIdConverter::ConvertStringToItemId to return the item ID in the provider format.
HRESULT ConvertStringToItemIdComplete( const BYTE * pbItemId);
[in] The item ID in the provider format.
S_OK
E_INVALIDARG
SYNC_E_INVALIDOPERATION when this method is called more than one time from IFeedIdConverter::ConvertStringToItemId.