Detailed Calendar Settings
Each security group-Sites, Calendar and Lync-has their own Detailed Settings. Let's review the Calendar Settings.

2. Try It: Edit the Calendar Settings
The Office 365 Admin Center is still open.
Go to External Sharing->Calendar.
Click on Go to Detailed Calendar Settings.

Security within your organization:
By default, Office 365 allows people in your company to share their calendars using a public web address (linked online.)

Security outside your organization:
You can share calendars via web link with anonymous users. How much data should you share in public?

The options are:
Free/Busy with time, only
Free/Busy with time, subject and location
All calendar information

Click Save.

Keep going...

Home->Admin->Office 365->External Sharing->Calendar