One of the failed sign-in windows showed a long string under a field labeled Microsoft Information Protection API. Running that value through the Entra admin portal revealed what we needed. At that point, the focus shifted to what was happening during authentication. The answer came from a closer look at the Microsoft Entra sign-in logs and a hidden dependency that I wasn’t aware of.
If you're tired of different bugs slowing things down or dealing with corrupted files, we are happy to show you how Mailbird can give you a better experience. In typical Microsoft fashion, there are also additional rules for certain older platforms that Outlook not opening on Windows 10 will make you feel very confused about 2FA. We'd be remiss to not tell you there are certain accounts (like Xbox 360) that always require 2FA as well as a special app password.
Then switch to the Processes tab and find all OUTLOOK.EXE items in the list. Click on each OUTLOOK.EXE to select it and hit the "End Process" button. If your user profile or folder is stored on a network drive, Outlook will be slower to respond and might become a hanging outlook problem. I decided to try and fix it by uninstalling and reinstalling. I also removed some old add-ins and an old, inactive account (but Outlook worked no problem Outlook not opening on Windows 10 with these for a long time).
Users who had been working normally suddenly Outlook not opening on Windows 10 received the CAA2000B error / AADSTS (after the token expired). Most Outlook problems can be resolved with proper troubleshooting and maintenance. Following the fixes above will help you keep your Outlook running smoothly and protect your productivity. We hope this guide proves useful in resolving your Outlook problems efficiently. Outlook accounts can have up to 100GB of storage per mailbox.
Performance may be decreased if you use the Outlook AutoArchive feature or sync to Outlook with a mobile device. These processes can use a large number of resources. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. If Outlook keeps crashing, you can run the Outlook not opening on Windows 10 Outlook Diagnostics Tool to scan and fix common issues related to Outlook. Close Outlook and press Window logo + R keys to open a Run dialog box. Select the Include items with the "Do not Auto Archive" checkbox and click ok.
Optionally, you can try to recover additional repaired items from the backup personal folder. You can use the Inbox Repair Tool (scanpst.exe) to repair corrupted Personal Folders (.pst) and Outlook Data (.ost) files. This is useful when your OST file is relatively big (more than 5 GB) and it would take a long time to recreate it. Also, it can be useful when you are getting errors when importing data from a PST file.
How to Close Unresponsive Outlook on WindowsOpen Task Manager: Right-click on the taskbar and select "Task Manager" or use the Ctrl+Shift+Esc shortcut.Locate Outlook Process: In the Processes tab, find the "Outlook" process.End the Task: Right-click on the "Outlook" process and select "End Task."More items...
I would say first things first is figure out if any of Outlook not opening on Windows 10 these actually resolves her issue, and then (if so) document it on a quick 1-pager that she can follow if/when you’re not available. When the scan is done and errors have been fixed, run scanpst.exe again until no errors are found anymore. If after scanning the file more than 3 or 4 times errors are still found, you might want to copy over your data in a new pst-file. We have tried all things mentioned above (except reconnecting the MS account), but the only solution so far is deleting the users profile. If I run an online repair and reboot her PC it will usually work for a day or two. Kinda at a loss at this point, I am thinking about wiping the PC and starting again.
Outlook users at times encounter issues and errors when working with the application. By understanding the common Outlook issues, users can swiftly troubleshoot and resolve most of these errors. If there is corruption in the Outlook data file (PST), Outlook not opening on Windows 10 the solution is to repair the file using the Inbox Repair Tool (ScanPST), which comes pre-installed with Outlook. However, if the tool freezes or fails to repair the PST file, the best solution is to use Stellar Repair for Outlook.
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. This issue affects all Outlook versions on Windows 7, Windows 8, Windows 10. 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.
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.