How to Open a Site Calendar in Outlook
1. Open Internet Explorer then navigate to https://portal.microsoftonline.com.
10. You will now see the site calendar in Outlook under Other Calendars.
Now you can easily add items to the site calendar from Outlook, assuming your administrator has given you the appropriate permissions. Other users in your organization can also use this same method to add the site calendar in Outlook. The site calendar makes it easy for everyone to stay informed and connecting the calendar to Outlook just makes it more convenient.