To make Outlook 2016 open on startup, you can follow these steps:
1. Open Outlook 2016 on your computer.
2. Click on the "File" menu in the top-left corner of the screen.
3. Click on "Options" from the dropdown menu.
4. In the Options window, click on "Advanced" in the left-hand sidebar.
5. In the Advanced options, scroll down to the "General" section.
6. Check the box next to "Start Outlook 2016 for this user when Windows starts."
7. Click on the "OK" button to save the changes.
Once you have completed these steps, Outlook 2016 should open automatically whenever you start your computer. If you ever want to disable this feature, simply return to the "Advanced" options and uncheck the box next to "Start Outlook 2016 for this user when Windows starts."