Create one sync setup to sync 3 contacts information sources:

• create 3 information sources of kind Contacts
• configure each information source to sync bidirectionally (both "to" and "from") or unidirectionally (only "from" or only "to")
• ^*optionally, for each information source, configure a filter to sync a subset of content
• ^*optionally, for each information source, configure a schedule to control when syncing occurs
• sync a mixture of the following kinds of information sources:
• contacts that reside on that Mac — i.e., contacts in a specific Apple Address Book's contact Group^** on the local Mac
• contacts that reside in Exchange — i.e., "personal" contacts in a specific contact folder within an Exchange account (GAL [Global Address List] contacts are not supported)
• contacts that reside in Google — i.e., contacts in a specific contacts group within a Gmail account
• ^*contacts that reside on a different Mac — i.e., contacts accessed via Sync'Em running on a different Mac (these are the contacts in the Sync'Em DB as they have been sync'd by that Mac, potentially from multiple sources)

^*Not yet available in the current version. See the product roadmap for more information.

^**Any contact entry in an Apple Address Book can appear in multiple Address Book groups (groups are actually "views" upon the collection of contacts). All contact entries appear in the "All" group. When you configure a Sync'Em information source to sync Apple Address Book Contacts, by default it will sync with the "All" Address Book group. Alternatively, you can specify an information source Filter^* to sync with a specific Address Book Group (e.g., other than the "All" group). Contacts that are visible in both in the Address Book group being sync'd and in other Address Book Groups will be updated for all Address Book Groups in which they are presented (which is the same behavior as when you update contacts manually, via the Apple Address Book). Google/Gmail contacts operate in a similar manner.