Random Tip: I love using Fantastical for my calendar events. But recently I was having a problem on my work Mac with Outlook starting by itself when my Mac first booted up. I searched and searched and finally found a fix via an answer on a Microsoft forum:

Do you have Fantastical or another application set to run at startup that interacts with your mail or calendar of Outlook. That’ll cause it to start even if Outlook is not explicitly setup in the Login Items of your account.

Hallelujah! Now my Mac doesn’t turn into a goobered mess when it boots because it’s trying to start Outlook and everything else at once.