there is a plugin for that:
but it will require some basic filemaker skills to integrate that in your solution, but they have good manuals to do that.
Yes i have used that but it seems to only download a quater of my contacts.
I guess i will have to manualy add them all.
I have used it before and it allows syncing between the two databases (Address Book & a FM database). But you need to have a good understanding of how the plugin works. If regularly syncing the data is importing to you, then you might want to hire a consultant that has a good understanding of AddressBookManipulator plugin. If you're on the cheap, you might want to check the examples from Productive Computing or ask for input from them.