How to Sync Office 365 Calendar With Google Calendar
Here's how to sync Office 365 (now Microsoft 365) and Google Calendars in order to bring more visibility to your schedule. You can combine the two and view all of your calendar events in one place. To do this, you need to share your Office 365 calendar with your Google calendar. Here is how to do that:
Log into your Outlook Office 365 account and go to the Calendar Tab
Then click “Share” and select which calendar you want to share access to. Type in your Gmail address in the "Enter an email address or contact name" field, determine access settings, and then click Share.
Now, open your Gmail and find the email that you just sent yourself. Right-click the blue link "this URL" and hit "copy link address" -- this URL should end with "reachcalendar.ics".
Under "Other calendars" click the plus sign and select "From URL" to paste the .ics link.
Finally, click Add calendar.
And you're done!