Microsoft Jet database applications cannot use Microsoft Jet-specific objects and methods with external data sources. The following objects and methods are not supported through the IISAM drivers.
| Unsupported object or method | Type |
| CompactDatabase | DAO method |
| Container | DAO object |
| CreateDatabase | DAO method |
| CreateField | DAO method (This method is supported on new tables but cannot be used to expand tables with existing fields.) |
| CreateQueryDef | DAO method |
| DeleteQueryDef | DAO method |
| OpenQueryDef | DAO method |
| ListParameters | DAO method |
| ListTables | DAO method |
| SetDefaultWorkspace | DAO method |
| Document | DAO object |
| QueryDef | DAO object |
| Relation | DAO object |
| RepairDatabase | DAO method |