OUtlook will not open on my laptop.

For classic Outlook on Windows, the next best checks after Repair are:

1. Start Outlook in safe mode
   • Press Windows key + R.
   • Type Outlook /safe and select OK.
   • In Choose Profiles, accept the default profile and select OK.
   • If Outlook opens in safe mode, the issue is likely an add-in.
2. Disable all COM add-ins if safe mode works
   • In Outlook, go to File > Options > Add-ins.
   • At the bottom, confirm Manage shows COM Add-ins, then select Go.
   • Clear all selected add-ins and select OK.
   • Restart Outlook normally.
   • If Outlook opens, re-enable add-ins one at a time until the failing add-in is identified.
   • Do not remove add-ins during this test; disable them only.
3. Reset the navigation pane
   • Close Outlook.
   • Press Windows key + R.
   • Type Outlook.exe /resetnavpane and select OK.
   • This removes navigation pane customizations.
4. Create and test a new Outlook profile
   • A damaged Outlook profile can prevent Outlook from opening.
   • Create a new profile using the steps in Create an Outlook profile.
   • Restart Outlook and, in Choose Profile, select the new profile.
   • If Outlook opens with the new profile, the old profile was corrupted.
   • Warning: if removing an old profile later, back up data files first. Offline cached content is deleted when a profile is removed.
5. Repair Outlook data files
   • Exit Outlook.
   • Run the Inbox Repair Tool (scanpst.exe) using the steps in Repair Outlook Data Files (.pst and .ost).
6. Install the latest Windows and Office updates
   • Outlook works best when fully updated.

If Outlook is also freezing or hanging, Microsoft also recommends checking whether antivirus software is up to date and whether it conflicts with Outlook.

For Microsoft 365 for business on Windows 10 or later, the classic Outlook startup troubleshooter in Get Help can also diagnose common startup issues.

References:

• I can’t start Microsoft Outlook or receive the error “Cannot start Microsoft Outlook. Cannot open the Outlook Window”
• Outlook not responding, stuck at "Processing," stopped working, or freezes
• Outlook not responding error or Outlook freezes when you open a file or send mail