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You can share a Google Calendar with a Google Group or with another user.
Outlook 2016's collaboration features allow an Outlook user to share any folder with another Outlook user. This should not be confused with Delegation, which is a feature allowing one Outlook user to act on behalf of another. The following paragraphs show the primary distinctions between folder sharing and delegation.
It is possible to share your Google Calendar with others. However, the only way to let people who don't have Google Calendar view your calendar is to make it public.