A company get mails to a general company mail-address (i.e
first we have build a nickname. But he have to approve each folder and each subfolder
so, there was made a user named headqurater. He have many folders and subfolders with classification of incoming mails (so we must not approve each folder by folder.)

six Users have got the proxy usage for headquater to read and send mails with his name

The addressbook of the proxy-user headquater is empty. Users can send mails as user headquater but they do not see and don't now the addresses in his addressbook.

If I approve the addressbook of headquater to the six users. But users do not see it when sending mails as headquater

Is there any possibility to get the content of headquater's addressbook?