FortiMail and addressbooks

Hello,

 On the FortiMail admin page, we have model 400E, at domain&users\address-books, I has the possibility to create contacts and contact groups either under system or under our defined domain.

 When I use the web-mail interface, I see those contacts in address-book. But if I use Thunderbird as mail client, I suppose it should be added as a LDAP directory server. My question is which are these values I should use to connect to it? Where can I interrogate my FortiMail to show these?

 I'm a bit confused, and unfortunately reading the documentations and google hits, didn't helped.

Best regards, Csaba