To open a calendar that belongs to an external user, you will need ether an invitation or.If an internal user has shared their calendar directly with you, the calendar will open with the permissions they provided otherwise – with the permissions set for your organization.In desktop Outlook, you can find it under Shared calendars. The shared calendar will appear under Other calendars in as shown in the below screenshot, or under People's calendars in Outlook on the web. If needed, copy the link to the calendar for future use, and then click the Save button. Once you do that, you will see the Calendar subscription details. You will be taken to either Outlook on the web or and, possibly, asked to log into your account.In the sharing invitation, click Accept and view calendar.The process of accepting a calendar sharing invitation by an external person is a bit different, but still very much straightforward in case you use Outlook for Office 365 or has an account. View calendar shared outside organization The calendar will appear in your Outlook under Shared Calendars:

Simply open the sharing invitation that your colleague sent to you and click the Accept button at the top. When a calendar is shared within the same organization, it can be added to Outlook with a single click. If you are using Outlook on the web (OWA) or, the detailed instructions are here: How to open a shared calendar in Outlook Online. This tutorial focuses on the desktop Outlook app installed locally on your computer.

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