Using Classic Outlook on Windows for personal email, calendar, and contact management
As mentioned by many, the option to add a shared inbox to the favourites is missing.
I rolled-back to the old version because of this, indeed it is a dealbreaker for the new Outlook.
Not only for myself, but also for many of my customers (I work as a consultant and program manager to support organizations in the implementation of M365 or other Move2 Cloud projects). Most organizations have a lot of shared mailboxes and they are critical for the execution of their business processes too. This wil be a deal-breaker for many organizations and for now I will advise them not to move to the new Outlook yet.
K.R. Jacob