Online calendars are a popular way to share schedules with many people across different platforms and applications. However, Outlook for Mac doesn’t support directly subscribing to online calendars because it doesn’t support iCalendar, the protocol needed for subscribing to these calendars.
Exchange and Office 365 do support calendar subscriptions to some online services using a webcal:// URI (similar to http://or ftp://) to access online iCalendar files. And they can act as a proxy to connect . . .
Continue Reading: Subscribe to online calendars and access them in Outlook for Mac