What Protocols are Supported By Outlook for 2-way Calendar Sync?

Question

I'd like to create a calendar that Outlook can subscribe to which can be updated either in Outlook or on the "calendar service" (Whatever that ends up being).

What protocols does Outlook support for stuff like this, and are those protocols two-way like I described?

e.g. I want Outlook to be able to update an existing calendar item that came from the subscribed calendar.

Answer 1

I recently did my own research on this and found the following website which I believe outlines the majority of the options.

Office 365 Supports:

• ActiveSync
• EWS
• MAPI
• WebDav

And as @camelsWriteInCamelCase indicates:

• The Outlook REST API