I have just events which are created by me directly in calendar app.

On the other hand, I cant find a way to integrate Outlook events into iCal app.

Ive created iCloud email just to integrate my iCloud events into the Spark app, according to this article.

I dont want to use any thirdparty software, which syncs calendars like sync-mac as it looks like huge overhead.

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See My Ical Calendar In Outlook How To Configure Your

This page provides instructions on how to configure your built-in calendar application to access your Office 365 calendar.

The page also includes links to documentation on how to perform a range of calendar functions from basic to advanced.

Confirm that Contacts is checked next to Also set up: and click Create.

See My Ical Calendar In Outlook Mac OS X Mountain Lion

Documentation for Calendar (Mac OS X Mountain Lion) can be accessed through the Help menu in the Calendar application.