After you delete the Outlook App Data folder, we suggest you restart your system first and then, open Outlook. If you’re still having problems, you can try resetting your Windows Firewall settings back to default. Then, you can try to start Outlook 2016 in Safe Mode and then check which add-in is causing Outlook issues, disabling that add-in. Since your app doesn’t open, you’ll have to use another Office app on your PC to trigger the update. This is because when you update one Office app, it automatically updates all other Office apps on your PC. Here, enable the “Quick Repair” option and choose “Repair.”
Maybe you’ve added a new program to your computer that doesn’t get along with Outlook, or your system has a virus. Regardless of the specific cause, there are several key troubleshooting fixes to try that might help. If you try to delete or move a large number of messages at once, Outlook can appear to freeze, but really, it’s working behind the scenes. If Outlook is performing some operation on hundreds or thousands of messages at once, it might appear to be stuck.
A corrupted profile, a damaged PST file, faulty add-ins, or improper Outlook startup settings often cause this issue. 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 startup problem. If you have reached here then we hope you got the solution as required to fix Outlook is having trouble starting.
Over the last couple of weeks it will not open normally (not even in safe mode) and I am having to do the windows repair option in settings. I have also tried the Classic Outlook Profile Set Up Troubleshooter. Trouble shooter came back as there was a problem running the trouble shooter, try looking for other solutions. When Outlook does open, it will send mail fine one minute and then the next minute it will not send any mail. The only thing is to know how to overcome them when they arise. Whether it’s defective add-ins, frozen Outlook, faulty data files, and many others, Fix Outlook Site you can manage all these problems yourself.
Running the /resetnavpane command removes all customizations to the navigation pane. Starting Outlook in safe mode, which starts Outlook without add-ins loaded, can tell you if an add-in is the source of the problem. After October 14, 2025, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows 10. Your PC will Fix Outlook Site still work, but we recommend moving to Windows 11.
One reason Outlook fails to launch is that you’ve installed faulty add-ins in the app. These add-ins may be working incorrectly, causing the app not to launch. It’s not uncommon, and you can easily make Microsoft’s email and calendar app open with a few simple fixes. We’ll show you what to do on your Windows 11 or Windows 10 PC.
When a Microsoft Office app, like Outlook, stops working, use Office’s built-in repair tool to fix your app. Microsoft includes this tool with all Office installations, and you can use it to find and resolve problems with all your Office applications. Wait for the antivirus to scan your system, find any viruses, and remove those items. If none of the Fix Outlook Site above methods fixes the ‘Outlook not responding’ problem, then there are chances that the Outlook PST in your Outlook profile is corrupt. In such scenarios, you need to repair the corrupt PST files. Check if the Outlook Will Not Open in Windows 10 error is now gone, by launching Outlook 2016.
It is highly recommendable or suggestive by IT Professionals and experts. Users Fix Outlook Site can effortlessly use this software to recover their damaged or orphaned PST files in Outlook and resolve related errors. The topmost part of this wizard is that you can easily recover PST Files up to 80GB, or in simple terms, there is no limitation for file size. Usually, this type of error shows some issues, errors, or glitches on the local disk where your Microsoft Outlook PST files are located. You can effortlessly use some troubleshooting procedures to set up your local drive. In this post, we have gone through the top ten Outlook errors.
Outlook may fail to open email due to corrupted Outlook profiles, add-ins, damaged OST/PST files, or outdated software. Antivirus conflicts and system issues can also cause startup errors or loading failures. This startup issue often appears when profiles get corrupted, damaged Outlook files, add-ins conflicts with system updates or antivirus.
Go in order so you have best chance of getting back to your inbox as quickly as possible. When the resetnavpane command is executed, what it does is it resets and removes all the customizations related to the navigation pane. In some scenarios, doing so fixes the “Outlook will not open” issue. Listed below are a few methods and solutions you can use to solve this Microsoft Outlook issue. In case these solutions do not work for you, you can use our repair tool to fix the problem and restore the items back to their original state.