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on November 30, 2025
After updating Office, you may experience a brief flashing window every hour, which triggers the OfficeBackgroundHandlerRegistration task to start running. In this case, sign in to the Microsoft 365 portal by using your administrator credentials, and then select service health to determine whether other customers are experiencing the same issue. If other customers are experiencing the issue, the issue should end when the service-interrupting event is resolved. If you’d like to share any feedback about this article, please let us know.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. In this window you can check the status, the number of failed requests (under Req/Fail), and which mailbox is experiencing the issue. Outlook email accounts are provided to employees, students, alumni, retirees, and for generic accounts.
If the self-help doesn't solve your problem, scroll down to Still need help? Switch your alias to an Outlook.com or Hotmail.com account. Customers using the contact support buttons at the foot of the support pages, or the "email us" links in support Virtual Agent, are unable to open the Help Pane. Check that you have not accidentally blocked the Gmail domain when blocking one Gmail user. Connect with experts, discuss the latest Outlook news and best practices, and read our blog.
Microsoft Outlook is a powerful email client, but users may occasionally encounter various error codes that disrupt email functionality. This guide outlines some of the most common Outlook error codes, their causes, and step-by-step troubleshooting methods. If you're having problems sending or receiving email, read how to Fix Outlook.com email sync issues. The methods provided in this article can be used to troubleshoot the error messages listed in the following table. If you typically use an Outlook.com account for email, this issue can occur if there are multiple aliases on the account and the 3rd party email address is the primary alias.
This software is integrated with powerful scanning and repair algorithms that can easily resolve all Outlook email errors and repair personal folder file non-invasively and efficiently. Moreover, the utility supports the all latest Outlook versions such as 2021, 2019, 2016, 2013, 2010, 2007, and all lower versions in Windows OS. If you manually type in the step-by-step Outlook troubleshooting secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary Outlook.com account.
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 the Windows Search service. The issues documented in this section have been reported after installing the recent updates listed below. We're investigating the issues and will update this page when a fix is available.
This happens to accounts that are configured in the iOS Mail app. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure. To access the calendar shared with your Microsoft 365 for business account, you'll need to accept the invitation from Outlook on the web, iOS, or Android. If you've already clicked 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. If you typically use an Outlook.com account for email, this issue can occur if there are multiple aliases on the account and the 3rd party email address is the primary alias.
We will ensure that all information is retained and only contacts with matching information in all fields will be cleaned up. To check if you have received the fix, review your contact list to confirm step-by-step Outlook troubleshooting duplicates have been removed. This issue has been mitigated and we are continuing to monitor the issue to ensure stability.
Nevertheless, you cannot save the recovered data when using the demo tool. For that, purchase the premium version of the software. After your account has been repaired, restart Outlook. Check if the problems causing ‘my Outlook keeps shutting down’ persist. After the restart, try opening Outlook again to see if the Outlook keeps shutting down issue is resolved.
Be aware that if you are connecting to an Exchange Server mailbox, your mailbox or your email messages are already being scanned by antivirus software on the server. For more information, see You may experience application pauses if you have a large Outlook data file. Optionally, if you have a Microsoft Exchange online archive, you can move items to that archive or create retention policies to automatically dispose of older items.
If Outlook won't open, you can't check your incoming messages or send an outgoing one from your desktop. You cannot create a new email address with @live.com as the domain address. You cannot create a new email with step-by-step Outlook troubleshooting @msn.com as the domain address. Existing Hotmail accounts have been permitted to keep their email addresses as well. If Microsoft Outlook is not working, we might be able to help you pinpoint why.