Turba is the Horde contact management application. It is a production level address book, and makes heavy use of the Horde framework to provide integration with IMP and other Horde applications.
Turba is a complete basic contact management application. SQL, LDAP, IMSP, Kolab, and Horde Preferences backends are available and are well tested. You can define the fields in your address books in a very flexible way, just by changing the config files. You can import/export from/to Pine, Mulberry, CSV, TSV, and vCard contacts. You can create distribution lists from your addressbooks, which are handled transparently by IMP and other Horde applications. You can share address books with other users. And there are Horde API functions to add and search for contacts.
Additional backends are easy to add - all you need to do is to implement a Turba_Driver subclass that implements a few simple methods and talks to your storage method of choice.
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