That process is pretty seamless, but not much help if your recipient uses a non-Microsoft product. If they click “Accept and view calendar” then they’ll be taken to to log into a Microsoft account, where the shared calendar will be made available. The person you’ve shared your calendar is sent an email. How the recipient accepts your invitation to view a calendar is where the process differs a good bit from sharing with someone inside your organization. When you’re done, click “OK” to share your calendar. By default, they’ll have the a permission level of “Can view all details,” which you can change if you want. Unlike sharing with people in your organization, you can’t give external people “Can edit” or “Delegate” rights. The person you’ve chosen will be added to the Permissions window. Add the person you want to share your calendar with and then click “OK.”
