Share Calendar
Objective: Add a shared calendar, to your Outlook Web App client.
Using your default internet browser, access your Outlook Web App client at https://outlook.office.com, sign in if prompted, and click on the calendar tile. Then follow the following steps:
At the bottom of the page, select 
to go to Calendar.
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In Calendar, on the toolbar at the top of the page, select Share, and choose the calendar you want to share.
Note: You can't share calendars owned by other people.
Enter the name or email address of the person you want to share your calendar with.
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Choose how you want the person to use your calendar:
Can view when I'm busy lets them see when you're busy but doesn't include details like the event location.
Can view titles and locations lets them see when you're busy, as well as the title and location of events.
Can view all details lets them see all the details of your events.
Can edit lets them edit your calendar.
Delegate lets them edit your calendar and share it with others.
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Select Share. If you decide not to share your calendar right now, select 
.
Notes:
When sharing your calendar with someone who's not using Outlook on the web, for example, someone using Gmail, they'll only be able to accept the invitation using a Microsoft 365 or an Outlook.com account.
ICS calendars are read-only, so even if you grant edit access to other people, they won't be able to edit your calendar.
How often your ICS calendar syncs depends on the email provider of the person you've shared it with.
Calendar items marked private are protected. Most people you share your calendar with see only the time of items marked private, not the title, location, or other details. Recurring series marked as private will also show the recurrence pattern.