Fix Outlook Won't Open Issues: Quick Solutions

You don't have appropriate permission to perform repair pst file without data loss this operation. Note that you can quickly tell how your mail is currently sorted, by the presence of a small triangle on the field headers. Please install the Windows 10 Fall Creators Update to fix this issue.

• We're investigating the issues and will update this page when a fix is available.
• If your antivirus software includes integration with Outlook, you may experience performance issues.
• If you 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 the check box is cleared, the service or startup program doesn't run when you restart the computer.
• Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
• If the problem doesn't occur after you restart Outlook, one of the add-ins is likely the cause of the problem.
• If you have email messages in an email program, you must import your email messages and addresses to the new user profile before you delete the old profile.
• You might need to set Windows Update to automatically download and install recommended updates.

Outlook known issues in the May 2019 updates

If so, wait a short time (usually two or three minutes) to see if Outlook starts working again. If you can't choose any of the menu options, type inside an email message, calendar event, or contact, Outlook may have frozen. There are three steps you can take to try to get Outlook working again. Outlook forwards meeting invitations to other attendees without anyone actually sending an update or forwarding an invite.

Outlook Known issues in July 2022 updates

You must have at least three user accounts on the computer to complete these steps. You can automatically repair your Office program files to resolve such problems as Outlook freezing or not responding. Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending mailbox not updating on IMAP and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running.

Outlook known issues in the December 2018 updates

There is a new version of outlook that is web based, but still works like an app, and has less problems. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure. To edit a shared calendar, go online to your own Outlook.com calendar, open Calendar for Windows 10, or use a mobile device. Maybe you've added a new program to your computer that doesn't get along with Outlook, or your system has a virus. Regardless of the specific cause, there are several key troubleshooting fixes to try that might help. If your antivirus software isn't up-to-date, Outlook may not function correctly.

Outlook Known issues in September 2020 updates

If you use the cloud-based Microsoft 365 on a PC or Mac, the automated Support and Recovery Assistant tool can diagnose and fix many issues, including Microsoft Outlook not starting. You may have to contact your antivirus software vendor to determine how to configure the software to exclude any integration with Outlook or to exclude scanning in Outlook. For a list of antivirus software vendors, see Consumer antivirus software providers for Windows.

Outlook known issues in the June 2017 security updates

User profiles help make sure that your personal preferences are used when you log on to Windows. As your mailbox size increases, more resources are required to open each folder. If you have a large number of items in any single folder, you may experience performance issues during certain operations. For more information, see Outlook performance issues when there are too many items or folders in a cached mode .ost or .pst file.



This happens to accounts that are configured in the iOS Mail app. Until you can install the Windows Update fix release, you can set a registry key 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 Rebuild Outlook Data File Quickly the Windows Search service.