Jet DB Compare compares two MS-Access / Jet 4.0 Databases. Not only Data but also the Structure is compared. -- but it does not compare VBA, Reports and Forms
If you a developer you can compare two mdb ( Access 2000 ) databases. And the old database will be upgraded with the new one. Copy the CompareData.mdb and 'newdatabase.mdb' to your 'olddatabase.mdb' directory. And run this application.