If there is a departmental or co-worker's calendar you have access to and want to open it in Outlook, please follow the steps below. Please note, that if you were just granted access you might need to close and re-open Outlook first.
Step 1: Open the calendar section of Outlook.
Step 2: Near the top of the window, click the option to Open Calendar and in the menu that drops down, select Open Shared Calendar...
Step 3: The Open a Shared Calendar box will pop-up. If you already know the exact name of the calendar you can type it here. Or you can click the Name button and search for the calendar name in the Global Address List.
If you clicked the Name button, then you will see the window below. Start typing in the box near the top left to locate the calendar you want to open. Once you have located it, select the name from the list and click OK.
The previous box will now be populated with the calendar you selected from the list above. Click OK to complete the process.
Step 4: The shared calendar will now show up on the left side under a Shared Calendars heading.