Outlook 2016 missing Outlook Address Book tab

I have a client that's got Outlook 2016 running on Windows 10 and uses Office 365/ Exchange.  They have four PC's and shared a Public Folder address book with all four PC's used fine for sometime.  However last week PC1 has lost connection to the shared address book.  

When in Outlook 2016 I click on the folders icon (bottom left-hand corner) and then select the exchange account (Events) to see the shared address book.  I then right click on the shared address book and select add to Favorites.  Then I click on contact/people icon (bottom left-hand corner) and then right click on the shared address book within favorites.  This should then display a dialog box with around five tabs along the top, but I'm only getting three tabs and missing the tab Outlook Address Book.  

The question is how do I get this tab back (Outlook Address Book) so that I can tick the tick box to make it appear within the list of address books?
scratcheIT ConsultantAsked:
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Jackie ManCommented:
Check the permission of the shared mailbox in Exchange / Office 365 and double check whether the user has been removed the permission in shared mailbox.
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scratcheIT ConsultantAuthor Commented:
Thanks for the reply, yes sorry I forgot to mention that I have checked the security rights and they are all correct.  I think the issue has been caused by the user on PC1 somehow.
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Jackie ManCommented:
Have you tried to remove the mail profile for user 1 and add it back again?
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scratcheIT ConsultantAuthor Commented:
No, I haven't tried removing the mail profile yet, my client is still trying to find his password hence why I haven't.  I shall get the password and try this out.
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scratcheIT ConsultantAuthor Commented:
My client found the password for his email accounts so I have created a new Outlook profile and set up all three email accounts within it.  They are now working fine with the shared contacts as requested...
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