Can not open Outlook.

Question

I can not open Outlook. I have restarted my computer already.

Answer 1

Hi @Ken Peterson,

Welcome to Microsoft Q&A forum.

Thanks for reaching out and sharing the Outlook issue. To help us investigate, could you please share a bit more information:

1. Which version of Outlook you are using, such as New Outlook, Classic Outlook, or Outlook on the web.
2. What happens when you try to open Outlook, including any error message or screenshot if available.
3. When the issue started and whether anything changed recently, for example system updates or new software.
4. Your device type and operating system version.

This will help better understand the context and provide more targeted support. Any additional information will help us better understand and support you.    

Thank you for your time and understanding. I'm looking forward to your reply.

Answer 2

If Outlook is not opening even after restarting your computer, you can try the following troubleshooting steps:

1. Repair Office: Use the repair option in the Control Panel to fix any issues with the Office installation.
2. Reinstall Office: If repairing doesn't work, consider uninstalling Office 365 and then reinstalling it from your subscription.
3. Check Compatibility Settings: Locate Outlook.exe, right-click it, select Properties, go to the Compatibility tab, and ensure that the Run this program in compatibility mode for option is unchecked.
4. Selective Startup: You can perform a selective startup to identify if any services or startup items are causing the issue. Follow these steps:
   • Open System Configuration from the Control Panel.
   • Select the General tab and choose Selective startup.
   • Uncheck Load system services and Load startup items, then restart your computer.
   • Gradually enable services and startup items to identify the culprit.

These steps should help you troubleshoot the issue with Outlook not opening.

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References:

• What to do when Outlook will not open on my PC? - Microsoft Q&A
• Outlook not responding error or Outlook freezes when you open a file or send mail
• Outlook is unable to start in Windows 7 or 8