To display a quick view of your calendar and appointments on the right side of the Home screen:
Click on the View Tab, then in the layout section on the ribbon, click on the To-Do Bar and choose Calendar.
Your calendar and appointments will now be displayed on the right side of the Home Screen.
To see a more detailed view of your calendar in another window follow these steps:
Size the windows and move them around however you want them to look
You now have your inbox and calendar displayed at the same time!
If you want the calendar and mailbox windows to display next to each other every time you launch the Outlook, you’ll need to save your settings. To do this, go to File and choose Exit to exit Outlook instead of clicking the Close (“X”) button. This way, your settings are saved. The next time you open Outlook, your calendar and mail windows will open side by side.