Shared contacts?

[Bill Lindley]

I am still in need, for several of my customers, of a way for an office 
of people to be able to share a contact list.  Everyone needs to be able 
to update contacts.  Most everyone is on Windows but I have set up 
several Linux machines.

How can I do this with Thunderbird, or Eudora, or any other open source 
(or even closed-source) program? 

I've looked into LDAP but it seems horribly complex, and Thunderbird 
won't write to LDAP databases (**boggle**).

Help!

\\/