So, I got to wondering if I could 'sync' my address book out of my Communigate system with my MacBook Pro. A little digging and I found that the Address Book application has an import feature. It is able to handle csv, ldif, and vcard.
I brought up my Communigate web interface and took a look at Pronto. I couldn't find any way to export the data from the address book. So, after some thought, I decided to check the storage structures for Communigate. In the /var/Communigate/Accounts directory, I check inside my account area. There was a Contacts.mbox file.