Wow! Just tried out Address Book Server. The installation seemed a lot less complex than I recall. They provide an easy, paint-by-numbers quick start guide. Dead simple. So far, I'm stunned by how well it worked first shot. I started with a sync to my address book, then subsequently installed and sync'd my wife's. The two had long ago gone out of sync, so I suspected there would be a ton of errors. Nope - ABS did a terrific job of connecting them! <doing a happy dance>.

Definitely worth a try, especially with their free 10 user license promotion!