I have an old DOS program that saves data to a .dbf database file. I would now like to add data to the .dbf file through MS Access. I have successfully created a link to the table in Access and have been able to add data, however it does not show up in the DOS program. If I edit data in the table through Access the changes are reflected in the DOS program, however new additions are not. Any clue as to why?

When you add records do you also update the index? You can also update the index in the DOS program by running the rebuild index function .

What you could do is to use an ETL tool. You can have a look at Talend Open Studio as it is an ETL tool. It can perform extract, transform and load of data, but also data migration. In your case, it could be useful to operate the migration and do a daily synchronization.