Previous versions of DAO included some language elements that have been replaced in DAO 3.5. If your code still uses the old language elements, consider updating it to use newer syntax.
In order to use old language elements, you must set a reference to the Microsoft DAO 2.5/3.5 Compatibility Library. This library is larger than the Microsoft DAO 3.5 Object Library, so it takes longer to load. Your application will run more quickly if you use only the elements available in DAO 3.5. Additionally, Microsoft DAO often maps older language elements to newer elements internally. If you use the newer elements, you can avoid calling the extra mapping code.
See Also For a list of obsolete DAO features and their replacement features, search the DAO Help index for “DAO, obsolete features in.”