Visibility of shared contacts in Address book

My organization purchased a version of Office Business Premium.

I want to create a shared contact list for the entire organization.

The Public folder does not solve my problems, because I want shared contacts to be visible not in Folders, but in Contacts.

I created a user with the name "Chared contacts", granted users read / edit rights through his account, sent an email with an invitation to open the Shared Contacts folder. And she showed up!

But I can't add these contacts to GAL. Those, when creating a new letter, I do not see these users in the contact list.

Right clicking on the Shared Contacts folder does not allow this - option "Show this folder as an email Address Book" is missing...

How can (and can) this be done?