1. Verify/Add your work Microsoft account to Internet Accounts in Settings
2. Open System Settings
3. Go to Internet Accounts
4. If your "Microsoft Exchange" account is listed click into it, otherwise skip to step 5
   1. Ensure that Calendars is checked otherwise, it will not appear in Calendar
   2. Skip to step 6
5. If it's not listed, click "Add Account"
   1. Fill in your work email address and click Continue
   2. It will prompt to open a browser, accept, and proceed with sign-in from the browser
   3. Once the browser section is complete, close it, and you'll see a permissions screen
   4. Accept at least the Calendar's permission; otherwise, it will not appear in Calendar
   5. Click Done
6. Open the Calendar app
7. From the menu bar, select Calendar -> Settings
8. Switch the tab to Accounts
9. Select your Exchange account (work email)
10. Confirm that "Enable this account" is checked
11. Close out of the settings
12. In the left-hand menu you should now see a listing for your Exchange account
13. Expand the account, and you should see any resource or shared mailbox calendars that you have access to!