How to fix my outlook which is failing to open

Queenster Opoku Agyemang 0 Reputation points
2026-09-16T07:34:35.78+00:00

My Outlook cannot open; it says there is an error preventing me from opening it. Therefore, Outlook needs to be closed for that reason.

Outlook | Windows | Classic Outlook for Windows | For home

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  1. Thomas4-N 21,665 Reputation points Microsoft External Staff Moderator
    2026-09-17T09:49:32.4333333+00:00

    Hello Queenster Opoku Agyemang,

    Before trying more repairs, could you test whether Outlook can open in Safe Mode?

    Press Windows + R, type outlook.exe /safe, and press Enter.

    If Outlook opens successfully in Safe Mode, that usually points us toward an add-in issue. If Outlook still fails with the same error, please share the exact error message or a screenshot, along with your Office version/build. You can find the build in Word > File > Account > About Word.

    That should help narrow this down without having you repeat a long list of troubleshooting steps.

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  2. Singh, Akash 0 Reputation points
    2026-09-16T07:40:39.51+00:00
    1. Restart the computer and try Outlook again.
    2. Start Outlook in Safe Mode
      • Press Windows + R
      • Type: outlook.exe /safe
      • Press Enter
      • If Outlook opens, an add-in is likely causing the problem.
    3. Repair Microsoft 365
      • Go to Settings → Apps → Installed apps
      • Find Microsoft 365
      • Select Modify
      • Try Quick Repair first.
      • If that doesn't work, try Online Repair.
    4. Create a new Outlook profile
      • Open Control Panel → Mail
      • Select Show Profiles → Add
      • Create a new profile and configure your work account.

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  3. AI answer

    2026-09-16T07:34:54.0066667+00:00

    Try these fixes in order:

    1. Repair Office first.
      • Go to Settings > Apps > Installed apps.
      • Find Microsoft Office.
      • Select Modify.
      • Run Quick Repair first.
      • If that does not help, run Online Repair.
      • Note: Online Repair reinstalls Office and requires an internet connection.
    2. Start Outlook in safe mode.
      • Press Windows key + R.
      • Type Outlook /safe and select OK.
      • In Choose Profiles, accept the default Outlook profile and select OK.
      • If prompted, enter the password and select Accept.
      • If Outlook opens in safe mode, the problem is likely an add-in.
    3. Disable Outlook 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, then select OK.
      • Restart Outlook normally.
      • If Outlook opens, re-enable add-ins one at a time to find the one causing the problem.
      • Do not delete add-ins during troubleshooting; disable them only.
    4. Reset the navigation pane.
      • Close Outlook.
      • Press Windows key + R.
      • Type Outlook.exe /resetnavpane and select OK.
      • This removes navigation pane customizations.
    5. Create a new Outlook profile.
      • A corrupted profile can prevent Outlook from opening.
      • Create a new profile, then restart Outlook and choose the new profile in the Choose Profile dialog.
      • If Outlook starts normally with the new profile, the old profile was corrupted.
      • Warning: if removing a profile later, back up data files first. Removing a profile deletes offline cached content.
    6. Repair Outlook data files.
      • Exit Outlook.
      • Run the Inbox Repair Tool (scanpst.exe) using the instructions in Repair Outlook Data Files (.pst and .ost).
    7. If the exact message is: "Something is wrong with one of your data files and Outlook needs to close"
      • Update Outlook from File > Office Account > Update Options > Update Now.
      • That issue was fixed in Monthly Channel Version 2005 Build 12827.20470 and higher.
      • Registry workaround exists, but it is risky because incorrect registry changes can cause serious problems.
    8. If using Microsoft 365 on Windows 10 or later, run the Outlook startup troubleshooter.
      • Use the classic Outlook startup troubleshooter and follow the prompts in Get Help.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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