Most MAPI data types map one-to-one to a corresponding OLE DB data type. The one exception is the MAPI multivalued data type: except in the case of a binary property, this data type maps to the OLE DB DBVECTOR data type. DBVECTOR ExOLEDB deals with each binary property and multivalued binary property on a case-by-case basis. For example, free/busy data is stored as a multivalued binary. ExOLEDB will return this data as a stream.

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