AccdbMerge Pro has lot of functional improvements that overcome limitations of the free version and allow you to work more efficiently on the Microsoft Access diff and merge tasks. A comparison of Free and Pro versions is given below:
Primary database objects diff & merge
Basic data diff & merge
Support of password-protected files
Support of *.mde and *.accde files
Fields and their properties diff and merge
Command line arguments support
Table indexes and relationships diff and merge
Price
Free
Pro