Yes there is a ‘global address book’ in Lotus Domino.
His name is “Public Addres Book” (opposite to “Personnal Address Book” for the Lotus Notes client) and yes it’s stored in NAMES.NSF file (same name for the client)
For LDAP export, i’m sorry, i’m not an admin 🙁 but i’m pretty sure that it’s LDAP compliant
***ADDITIONAL COMMENT – Mike Kinder****
Absolutely – total LDAP support, it was LDAP before NT was. Domino’s Directory structure has always been based on x.500 – thus LDAP was easy. There is a free tool installed with every notes client called ldapsearch that allows you to search any LDAP directory. Syntax is in the Admin Help file (maybe just the regular help file). I have written application that exploit LDAP from Domino to others (ActiveDirectory) and vice versa. Easy to enable. Just have your admin make sure the LDAP port is enabled on the server document and use the “Load LDAP” at the server console. If this should be persistent, add “LDAP” (without quotes) to the server’s Notes.INI in the ServerTasks= line.
In addition to the above, Domino allows you to use LDAP against a cascading address book (or where more than one directory is used) as well. So you could cascade multiple directories on a server, and then serve the whole thing up as LDAP
***END Mike Kinder Addition****