If you have lots of information in Outlook and you want to get all that into
SharePoint, it is possible to import it quickly by following a few steps.
It is also possible with an ICS file.
ICS is a format for calendar files that are used by various calendars including
Google Calendar, Apple iCal and Microsoft Outlook. Calendars on websites can
also use this format, and in that case they can be downloaded to Outlook.
In this tutorial in the SharePoint Online from Scratch series, Peter
Kalmström, shows how to combine the downloading from a website with the SharePoint
connect to Outlook feature. By doing that he can have a calendar from a website
This is what Peter shows in the demo below:
How to download calendar from a website to Outlook.
How to create a new calendar in SharePoint.
How to edit links in the SharePoint Quick Launch.
How to switch calendar views in Outlook.
How to copy event from a website calendar and paste them into a SharePoint
Now you will see all the website calendar events available in the SP calendar.
Note that the calendars do not synchronize. This is an import, and if you
want to update the SharePoint calendar with new data from Outlook, you have
to import again.