You can read how to fix your Outlook problem on the internet, but sometimes the suggestions don’t work for your specific case. So, we have produced this list of general things to try why is Outlook not opening to resolve your problem in Outlook. Read on to find out how to fix common Outlook problems below.
I also removed some old add-ins and an old, inactive account (but Outlook worked no problem with these for a long time). After reinstalling, now it freezes constantly, even when not in use. Roughly every 5 seconds, the window freezes, grays out, and gives a "not responding" message--just as before. But it happens constantly without me even doing anything in Outlook now. To create a user profile, you must first create a user account.
Safe Mode loads Outlook with only essential components, allowing you to isolate and disable faulty add-ins. why is Outlook not opening We have tried all things mentioned above (except reconnecting the MS account), but the only solution so far is deleting the users profile. As @ode2joy said, clearing out the user’s profile usually works, which is a more thorough procedure than just deleting .nst and .ost files. You can automatically repair your Office program files to resolve such problems as Outlook freezing or not responding.
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. The navigation pane is the leftmost pane in Outlook where you'll find your folder list and the icons to move between Mail, Calendar, People, and Tasks. Running the /resetnavpane command removes all customizations to the navigation pane.
To sum up, the blog elaborated on all the major reasons for Microsoft Outlook keeps crashing problem. Furthermore, we learned six manual solutions to fix this issue. So, for a worry-free and risk-free conversion, using the professional tool is the optimum choice.
To determine the cause of the performance issues, start the Assistant, and run the Outlook Diagnostic in the Advanced Diagnostics section. Sometimes, your PST files can develop errors or why is Outlook not opening data inconsistencies, resulting in unexpected behavior in Outlook. When you suspect that there’s an issue with the integrity of your PST file, you can run Scanpst.exe to repair your PST files.
To manage your mailbox by reducing the size of the Outlook data file, see Reduce the size of Outlook Data Files (.pst and .ost). If repairing your Microsoft 365 programs didn't resolve your issue, move on to the next step. If Outlook isn't stuck at a screen that says "Processing," or this didn't resolve your issue, continue to the steps below. If those steps don't work, see Need additional help? This option could be useful if you constantly have to wait for Outlook to rebuild its data file when you restart.
Corrupted or badly set-up Outlook profiles can often cause start-up problems. The app might refuse to launch or crash why is Outlook not opening at the splash screen. The PST files will be repaired and the error will be resolved. 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.
One of the first and most effective steps is to launch Outlook in Safe Mode. This mode turns off all add-ins and custom settings, helping you quickly identify if a third-party add-in is causing the
why is Outlook not opening startup problem. After running any of the above processes, make sure you check for updates again to verify that all updates have been installed. Did Outlook still work correctly the last time you used it?
ProcedureExit Outlook.Open a Run dialog box. ...Type Outlook /safe, and then click OK.If the issue is fixed, click Options on the File menu, and then click Add-Ins.Select COM Add-ins, and then click Go.Click to clear all the check boxes in the list, and then click OK.Restart Outlook.Jun 25, 2025
If Outlook does not crash, this indicates that one or more Add-ins are to blame for the Outlook 365 crash. If this does not resolve the Outlook 365 crash issue, proceed to the next solution. Priyanka Kumari is a technical content writer in the fields of Email Migration, Data Recovery, Cloud Migration, and File Management.
This means Outlook will run with limited features and without any add-ins enabled. After that, Outlook will check for and install any available updates. Once the Outlook update process is complete, reopen the Outlook application. Again, check if Microsoft Outlook crashes when opening.
If you want to repair your corrupted PST file, opt for the Cigati PST Repair Tool. It will recover the corruption from your desired PST files. Outlook may remain stuck if other Office applications or processes are running in the background. I’m not certain to which post you’re referring, but everything that’s been mentioned so far can be done directly by the user. No elevated permissions are required to do any of these steps.