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Office 365 (Outlook on the Web) - Working with Other Calendars
Outlook Web App allows you to add other calendars to your calendar view. Depending on the permission levels you have been granted, you will be able to act on these permissions (free/busy, read, write, etc.).
If you've received an invitation to share someone else's calendar, you can select the link in the invitation to add their calendar to your calendar view. You can also go your calendar to add other people's calendars to your view.
1. Click on the App Launcher in the upper left-hand corner and select Calendar.
2. Within the Navigation Pane, right-click Other calendars and select Open calendar.
3. To add a calendar that belongs to someone in your organization (or a resource calendar), enter their name in "From directory:". This box works just like the "To:" box on a new email message. After you've entered the name, select Open.
4. To add a calendar that has been published on the internet, such as a ShareURL, enter the URL in the "Internet calendar:" box, and then select Open. The internet calendar must be shared publicly and the URL should end with ".ics".
NOTE: If you receive a URL from an Office 365 user and want to open up the URL via a web-browser, you must change "http" to "https" for the URL to work properly.