If you need a program to automatically import data into Act!, you can use the Importer for Act!.
This program will import data from any program and write that information into the Act! database. It can be used to import Contacts, Companies and Group info. This program will run automatically in the background and will generate log files for the modified data.
It uses a match-field to lookup the record. Then it will edit the data according to the field mapping. All settings are done using the field mapping.
This product is available in Dutch and English.
Download the addon: http://www.actaddons.nl/downloads/ImporterInstaller.exe
Download the manual: http://www.actaddons.nl/downloads/ManualImporter.pdf