We have recently moved from hosted mail (pop3/imap) to Office365. This works perfectly with Outlook 2016 on Windows. The 2016 mac version of Outlook is also really good. However it just does not auto display the shared mailboxes. This can be easily solved.
just a simple, file –> open –> other users folder. and select the shared mailbox.
It is a lot harder to add a shared mailbox to the default mail.app in Mac OS X. This manual configuration did not work. It suggests to use your main account and a slash and then the shared name or alias.
Here are the configuration details (which did not work for me)
(if necessary: Port 993, SSL = ON and Password authentication)
(if necessary: Port 587, SSL = ON and Password authentication)
I could not get it to work.
but this did work:
login as admin in office365 go to “users” and not the shared mailboxes.
There are users for shared mailboxes, but no one uses the user account. It is just internally needed for the mailboxes. Click the one that is corresponding with the shared mailbox and reset the password.
You can now use the credentials as above. Just use the pseudo user from the user list and the new password and as mail address the one from the shared mailbox
and outlook.office365.com as server. You can use the default mail.app in Mac OS X (10.10 or 10.11) It is a lot more work then with outlook, but if you are really fond of the default application, this is a solution to keep using it without moving to outlook.
Enjoy and good luck!