GeoMerge

GeoMerge is a geoprocessing utility that allows you to merge two or more shapefiles or TAB files into a single shapefile.

Select two or more shapefiles or TAB files that are to be merged, and click the 'Merge Files' button. The files will be validated for a common schema. If all of the files selected have exactly the same column definitions in the .dbf file the records and shapes from each individual file will be concatenated into a new shapefile.