Shared Calendars not available in Outlook 2011
I have searched on the web for days on how to resolve this issue but no solution.

Here is how I solved mine;

Delete your Outlook profile as the calendar is corrupt on it

Link: https://support.office.com/en-us/article/Manage-profiles-in-Outlook-2016-for-Mac-fed2a955-74df-4a24-bef6-78a426958c4c

Then, close and reopen outlook, you will be prompted to create a new profile.

Go back to your calendar on outlook. Add a calendar now and it should show up on the left view.

It worked for me and it should work for you.