I have tried all of these solutions and I do not find Outlook in any of them, as an enabled application. Do I need to uninstall Outlook?
You can take the following steps to prevent Outlook to auto open at boot.
Kindly check the Startup Folder. Press Windows + R to open the Run dialog. Next, Type shell:startup and hit Enter.
Look for Outlook in the startup folder. If you find it,delete it.
Furthermore, Press Ctrl + Shift + Escto open the Task Manager. Go to the Startup tab.
If Outlook is listed there, disable it.
Lastly, check system Configuration Utility (msconfig):
1.Press **Windows + R, type msconfig,**and hit Enter.
2.In the System Configuration dialog, click the Services tab.
3.Check the box labeled Hide Microsoft Services.
4.Uncheck the box next to Outlook if it’s listed.
5.Also, check the Startup tab and uncheck Outlook if it appears there.
Please don't hesitate to reach out to us if you need further assistance with the issue.
Best Regards
Bertrand