LDAP, web interface, Outlook integration

I have a customer with several computers, one of which has his
company client address book in (cringe) Outlook...

Would like to move that address book to a server (perhaps LDAP) so
everyone could share the same address book, and also to permit viewing and
editing it from a web interface.

Any suggestions on web resources, or what's good, or what to stay away
from?

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