A Version Control Tool by Reliable Software

Differences
The Lite version only supports e-mail peer configurations and therefore is easier to configure and use (simpler join and invite dialogs). In most cases that's the best and the simplest option. Each machine taking part in collaboration communicates with other machines using e-mail. Co-op Lite supports MAPI access to the email client, or direct SMTP/POP3 access to an e-mail server, including Gmail.

In the future, we are planning to add some specific functionality to Co-op Pro that will not be available in Co-op Lite, for instance support for backups and check-out notifications.

Co-op Lite is able to interoperate (as an e-mail peer) with Co-op Pro.

List of Differences
Features that are available only in version Pro:
LAN configurations--hubs and satellites. Synchronization over the LAN.
Option to save a large project invitation to disk or to an FTP site.
Option to save exported history to disk or to an FTP site (for now, only during Project>Invite).
(Planned) Export and Import History through an FTP site.
(Planned) Backup and Restore of the whole Code Co-op database to and from disk or an FTP site.
(Planned) Check-out notifications.