Hello Peter

you can use the MercuryH PH-Server-Module . With this module you can "share" a normal Pegasus-Mail-Adressbook for Users which has a PH-client.

Info from the Mercury-Help-File:

>MercuryH PH Directory Server
>
>MercuryH is a directory services module - it accepts requests for addressbook lookups from other systems and returns lists of possible matches. The protocol used by MercuryH is called the PH >protocol, also sometimes known as the QI/CSO protocol: it is widely-used on the Internet by mail clients such as Pegasus Mail and Qualcomm's Eudora. At the time this help file was written, an >Internet standard was in the late stages of being formalised for the PH protocol - MercuryH implements that standard.
>
>In order to fulfil queries, MercuryH uses a Pegasus Mail addressbook file, mapping the fields in the addressbook file onto the standard fields defined by the PH protocol. Any Pegasus Mail >addressbook can be used by MercuryH, and you can use the import/export tools provided with Pegasus Mail to create and maintain addressbooks for MercuryH.
>

Hope this helps

Hans 

I use Mercury as internal mailserver with IMAP, so all mails are centralized end can be seen from every computer in the house.

Can this also be done for the Address Book? So that every time I add a person to the address book it will be available on all PC's?

Peter