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Opened Sep 22, 2025 by Maggie Becerra@maggiebecerra
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Outlook crashes or stops responding when used with Office 365

A vast community of Microsoft Office365 users that are working together to support the product and others. Simran Bhatia is a technical content writer engaged in writing clear, concise, and SEO-optimized content. With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms. This method using the SCANPST.EXE will not work if the PST Files are in bulk or they are encrypted.

To effortlessly change your settings so that your inbox looks the way you want it to, see Personalize your new Mail experience in Outlook.com. 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. You can also add the secondary connected accounts (Gmail, Yahoo, etc.) in Outlook.com as additional accounts in the Outlook profile.

If the check box is cleared, the service or startup program doesn't run when you restart the computer. Repairing your Office programs can resolve issues with Outlook not responding or freezing. Errors in Microsoft 365 files are repaired automatically. If Outlook isn't stuck at a screen that says "Processing," or this didn't resolve your issue, continue to the steps below. Outlook may remain stuck if other Office applications or processes are running in the background.

Customers with only a 3rd party email address set up as the username of their Microsoft Account will be asked to add a 1st party Microsoft alias to their account before accessing Outlook.com. This will cause The Turn on shared calendar improvements checkbox to be disabled for all users. The UI checkbox will be unchecked and disabled, so end users cannot turn on the improvements.

Fortunately, with the right Outlook troubleshooting strategies, many of the most common Outlook problems are quite straightforward to troubleshoot. Below, you will see some of the most common issues that users run into, and what the most efficient way to troubleshoot Outlook is. Visit the Technology Help Desk Support page to locate your local campus contact information or to submit an online technology support request. For password issues you must call or visit the Help Desk in person. The maximum number of recipients for an individual email through USNH IT mail servers is 300. If setup failed, choose Change Account Settings.

After performing the method start Outlook again to check if the method has worked and eliminated the error. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Follow the steps below to disable Outlook’s compatibility mode. Now, that you know the reason for the Outlook Profile being stuck, it should be easier to choose the right methods to fix the issue.

However, we came across many users who are still struggling with this Outlook issue. They still wonder ‘Why is Outlook constantly not responding? ’ So, it is possible that your PST file will get corrupted and you can lose all important data. Or, if the problem is itself due to oversized PST getting corrupt, you need to recover PST data as soon as possible. Let us switch to professional suggested software. Run the classic Outlook advanced diagnostic troubleshooter if you've tried all of the preceding steps and Outlook is still crashing or hanging.

Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Try steps 1 through 3 in order until the issue is cleared. If you see a .pst file instead, skip this fix and check fix 6 below. 5) Wait for the program to detect the latest version of Outlook, and then follow the on-screen instructions to update your Outlook.

If so, wait a short time (usually two or three minutes) to see if Outlook repair Outlook data file starts working again. You might need to set Windows Update to automatically download and install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below.

If this still does not work, try repairing MS Office. Then, select your account and click Open File Location. This tool has helped IT teams across healthcare, finance, education amongst many others. Whether it’s restoring email from encrypted backups or recovering badly broken PSTs, Stellar gets the job done with minimal fuss.

If the problem doesn't occur after you restart Outlook, one of the add-ins is likely the cause of the problem. Restore the add-ins one at a time until the problem does occur to determine which add-in is causing the problem. Make sure that the latest updates for Outlook are installed. For more information, see How to install the latest applicable updates repair Outlook data file for Microsoft Outlook (US English only). Many of these items can be automatically checked by the Classic Outlook Advanced Diagnostics troubleshooter.

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Reference: maggiebecerra/shaunte2010#9