How to create Office 365 shared calendar and overlay it with SharePoint calendar

Many businesses require Office 365 calendar sharing feature in Exchange Online and SharePoint environment. But by default, you can share Office 365 calendar in Outlook only with people that are using Outlook too (i.e. Office 365 and Exchange).
In this short guide I will show you how to create Office 365 shared calendar and overlay it with SharePoint calendar if needed. 

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In the first case I will create Office 365 shared calendar, in the second example I will overlay it with SharePoint calendar on any of yours SharePoint sites.

1. How to create Office 365 shared calendar

On your Outlook calendar page click "Share", then select the calendar you want to make available for other users.

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Also, you can do bring up the same menu by right click on the target calendar in the list.

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Now start to type names or email addresses of the people you want to share Office 365 calendar with. You can choose several persons or emails in this field. 

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In the next step we will adjust shared office 365 calendar permissions. In this field you can delegate the access rights for each user to your events.

Availability only is the lowest permission level, which displays only the time of your events without any titles and other details.

Limited details access allows another person to view only the events titles, time and location of events in your shared calendar Office 365.

Full details access displays to chosen users all your items via office 365 calendar sharing and they can view your events in Read Only mode.

Editor permission makes your events editable for other user. This option is available only for users from your organization, as well as Delegate access.

Delegate is the highest level of office 365 calendar permissions. A person with delegate access can view and edit all items in your shared calendar Office 365. Moreover, a delegate can send and respond to meeting requests on your behalf.


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You are able to edit Subject of the email if needed. Then click "Send".

Each person from the chosen list receives an email message with invitation to your office 365 calendar sharing.


2. How to add Office 365 shared calendar to your SharePoint site and overlay it with SharePoint calendar.

Virto Office 365 Calendar Add-in allows you to display any number of SharePoint and Exchange Online Calendars (including shared calendars) in a single view.

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You can have all your Exchange Online Calendars with the same data source colors and the same office 365 calendar permissions on any SharePoint page. No coding, no additional customizing, no complex adjustments! 

Just check the box in Virto Office 365 calendar settings and all your shared Exchange Online calendars will be automatically added to Virto Office365 Calendar.


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Virto Office 365 Calendar Add-in is a feature-rich scheduling solution for SharePoint online (Office 365). This Add-in allows you to add or edit items with a single mouse click and display color-coded events in different timescales. You can view schedules in Day, Week, Work Week, Month, Year, Task and Multisource View. Also, with Virto Office 365 Calendar Add-in you are able to overlay SharePoint Calendar with Exchange Online shared calendars to display all your private events, meetings and shared calendars in one place.

Learn more about all features of Office 365 Calendar Add-in and try its 30-days free fully functional trial!