In the meantime, please use the workarounds suggested for each issue. For persistent issues, use FixTechGuide’s automated tools to perform deep diagnostics and security checks. Stay updated, back up regularly, and enjoy uninterrupted productivity in your Outlook workspace. This process checks for structural issues and automatically fixes them. After the repair, reopen Outlook to confirm successful startup.

Disable Hardware Graphics Acceleration

Find solutions to common problems or get help from a support agent. Please install the Windows 10 Fall Creators Update to fix this issue. Outlook 2016 freezes when you try to preview an Excel file that's attached to an email. After updating Office, you may experience a brief flashing window every hour, which triggers the OfficeBackgroundHandlerRegistration task to start running.

Do you see the message "This set of folders could not be opened"?

• This often resolves startup errors caused by configuration issues.
• Find solutions to common problems or get help from a support agent.
• Many users encounter startup freezes, profile loading loops, and crashes following major Windows patches or Office updates.
• You don't have permission to create an entry in this folder.
• Many users face this frustrating issue after a Windows update or due to corrupted Outlook data files.
• If you manually type in the secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary Outlook.com account.
• When this registry key is set, Outlook will use its own built-in search engine.

In this guide, FixTechGuide explains the top causes and provides simple step-by-step solutions to help you fix Outlook not opening on Windows 11 quickly. Until you can install the Windows Update fix release, you can set a registry key repair corrupted OST in Outlook that will cause Outlook to stop using the local Windows Search service. When this registry key is set, Outlook will use its own built-in search engine. The built-in search will display the message below to indicate it is not using the Windows Search service.

Outlook known issues in the Jan 2018 updates

This issue affects all Outlook versions on Windows 7, Windows 8, Windows 10. If you solve Office 365 mailbox sync delays can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook. If you are having problems with Outlook, there are a few things we can help with to get you back to sending and receiving your email. Sometimes, aggressive antivirus programs block Outlook’s execution. If Outlook opens, whitelist the Outlook process in your antivirus settings. This ensures Outlook and Windows run the same DLL versions and registry references.

Outlook known issues in the November 2019 updates

Once the scan completes, reopen Outlook and check if the issue is resolved. Go to File → Options → Add-ins → disable all add-ins, then re-enable them one by one to find the faulty one.



If you've already clicked Exchange connectivity diagnostic the Accept button in Outlook 2016, you won't be able to re-accept the invitation from another Outlook application. The person who sent you the invitation will need to remove your permissions and then send a new invitation. This command deletes the custom folder views, restoring default configurations. It’s harmless and resolves 30% of stuck startup issues according to Microsoft community reports.

Windows Command prompt running OfficeBackgroundHandlerRegistration task flashes every hour

This occurs because custom form script is now disabled by default. Are you struggling to open Microsoft Outlook on your Windows 11 PC? Many users face this frustrating issue after a Windows update or due to corrupted Outlook data files.





By the end, you’ll know exactly how to restore your Outlook and prevent future errors. If your Microsoft Outlook won’t open after a recent Windows update, you’re not alone. Many users encounter startup freezes, profile loading loops, and crashes following major Windows patches or Office updates.

Note that you can quickly tell how your mail is currently sorted, by the presence of a small triangle on the field headers. Another options is to use the Filter Email button on the ribbon. You may notice that All, Unread , Mentioned and other sort and filtering options, such as By date, and Newest are missing in Outlook above your email list.