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There are also notes about legacy per-user auth being an issue, however we had two accounts left in per-user auth but none with the issue. If you think that it is patch related, roll back the patch and see if that fixes it for the end users. If it’s an RDS server and the cache is also on the server, if the server crashes, reboots abruptly, is full, there are many reasons. Instead of removing the profile, remove the OST file and let it recreate. Find solutions to common problems or get help from a support agent. If you have Outlook in your startup folder, remove the shortcut from the startup folder. Use the classic Outlook for Windows connectivity troubleshooter to troubleshoot Outlook connectivity 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. For contacts, you can select Filter in the upper right to select what to display in the list and how to sort. If you decide you don't want the calendar you created, right-click the calendar and select Remove. Under Calendars, My calendar is the default selection and displays the calendar in Month view. Find the Microsoft 365 app and right-click on it to see the available options. You will see two options – Change and Uninstall. A vast community of Microsoft Office365 users https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ that are working together to support the product and others. Select faulty or incorrect add-ins and click Remove. In this guide, we will learn how to repair Outlook 365 in Windows 10/11 with the best possible ways. Outlook stores all your email messages, meetings and events, contacts, and tasks in data files. You can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors. Are you having trouble starting Outlook or receiving "Cannot start Microsoft Outlook. Cannot open the Outlook window" error messages? We can fix the problem for you, or you can use the troubleshooting steps we're providing below to help resolve these startup issues. The page serves as a homepage for many people because it includes a link to Outlook, a weather update, aggregated news tailored to you, and Bing (Microsoft's search engine). Some of these https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ accounts still exist as legacies, but it's confusing to sort through what is being phased out and what will remain available. To check if Outlook is not loading for everyone you can review the Microsoft Outlook twitter page, or check at a site like downdetector.com or isitdownrightnow.com. If none of that worked, I’d restore the server from backup when it was working and see what happens moving forward. If both of those don’t fix it, I’d run a full maintence cycle on the server. I couldn’t find anything in the Event Viewer that points to the root cause, nor could I find any similar issues online. These troubleshooting techniques apply to Outlook 2016 and 2011 for Mac. If that doesn't work, you can try repairing it. When you're done, you might need to restart your computer. Now you’ll have a fresh profile that should work properly https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ if the old one was the problem. When you do this, your Outlook https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ might have opening problems. For this reason, you should always turn off Compatibility mode for Outlook. If you restart it successfully, it will show you that one or more add-ins are defective. Now, it's time to uncover them by the elimination process. Step 1 - For both Windows and MacOS users, Microsoft Outlook has the https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-ost-and-pst-files-2025-guide/ ability to recover deleted items Outlook Desktop App. Microsoft has its own tool for automatically scanning and correcting Office when things go awry. You can read about it and then run the Microsoft Support and Recovery Assistant to see if that helps. It can automatically diagnose issues, troubleshoot, and fix problems with Outlook. Note that the above link is for desktop Outlook for Windows. A more general version that can also fix Office, Microsoft 365, and other Outlook problems can be found here. Start classic Outlook in safe modeIn Windows 10, click Start.Type Outlook /safe, in the Search programs and files and then click OK.Close and re-open Outlook.If the issue is resolved, you can keep working, or if you have time, take the following steps to find out what COM Add-in is causing the problem. This article describes how to set up multi-factor authentication (MFA) for Office 365 users. One of the most common security support requests we receive from our Office 365 customers is... Power for providing "An Outstanding Customer Service Experience" for its Assisted Technical Support. J.D. Power 2024 Certified Assisted Technical Program, developed in conjunction with TSIA. Restart Outlook and try to reproduce the problem. Find solutions to common problems or get help from a support agent. To update your password in Outlook, see Change or update your email password. If you're having problems setting up your email in classic Outlook, we want to help. You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally.