Hello Selene,
Thank you for reaching out to Microsoft Community. My name is Abu, I'm happy to assist you, hopefully, I will do so to the best of my knowledge.
I'm sorry to hear about the trouble you're experiencing with the Auto Start of Outlook(New).
I understand how frustrating this situation is for you.
Kindly note that this is a user-to-user forum, we are users helping other users, and we aren't Microsoft employees.
To Turn Off the auto start of Outlook ( New)
Using Task Manager on your Computer
- Right-click on the taskbar on your computer and select Task Manager.
- Go to the Startup tab.
- Find Outlook in the list Right-click on "Enabled" and click "Disable" to disable it from automatically starting
This should automatically stop Outlook from opening when you start your computer
If you have any questions, please let me know I will be more than happy to help you further.
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Regards
Abu