Shared Address Book on Zoho Hosted Email for Business- does not get used when Composing a new message

Shared Address Book on Zoho Hosted Email for Business- does not get used when Composing a new message

I signed up for a trial of the Hosted Email.  
Created a couple of email accounts.
I created an address book as shared.
I can add contacts to it and it is visible to all users.
However if I start a new email (Compose) and start typing an email address it provides choices from the main Contacts list but does not pull from the Shared Contacts list ??
This seems like a necessary feature for a shared Business address book.

Is there some way to make this work ?
Thanks
Daraius