fubo , 9 months ago

Your calendar app integrates with your email app. So when you create a calendar event and want to invite Bob to it, you can use your email contacts to find Bob. When you send the invite, it goes by email from your email system to Bob’s. When Bob opens it, his email app asks him if he wants to add the event to his calendar.

Your calendar app and Bob’s calendar app never talk to each other directly, but you’re still able to invite Bob to an event. Your calendar only talks to your email. Your email talks to your email service, which talks to Bob’s email service. Bob’s email client talks to Bob’s email service and then to Bob’s calendar.

This is actually good. It means that anyone can switch to a different email or calendar app and all they have to do is update their contacts. People can use Hotmail or Gmail or Microsoft or self-hosted email, and integrate whatever calendar they like alongside it.