Are you using a 64-bit Microsoft Access driver? Are your Extended Feature Classes joining on a single property or multiple properties? - Jackie -- View this message in context: http://osgeo-org.1560.x6.nabble.com/Mapguide-64-bit-and-ODBC-64-tp5082718p5082737.html Sent from the MapGuide Users mailing list archive at Nabble.com.