Compatibility mode is suitable for older software with Windows 10 that fail to run normally. Thankfully, Microsoft Outlook is fully optimized for Windows 10, meaning Compatibility mode is not necessary. You might be wondering what happens when you switch on the Compatibility mode for Outlook. When you do this, your Outlook might have opening problems. For this reason, you should always turn off Compatibility mode for Outlook.

• These files occasionally might become corrupted.
• All offline cached content will be deleted when you choose Remove.
• For more information, see Introduction to Outlook Data Files (.pst and .ost).
• If you are trapped in a similar situation that my Outlook is not opening, you may feel disturbed about the problem.
• Click the button below to download and install the Office uninstall support tool.
• Click the above link to have a quick download, then you can have Outlook errors fixed within minutes.
• If the troubleshooter can't fix your issue, or if you'd like to fix it yourself, see the next section.
• If you follow the above solutions, your Outlook will perform according to your expectations.

Older versions of Outlook may be out of support

Now, it's time to uncover them by the elimination process. Follow the steps below Troubleshoot Office 365 Sync and Login Issues to download the uninstall support tool according to your browser. Uninstall the Microsoft application restart the device and re install the Microsoft application and restart the device.

Why Won't Outlook Open?

Should you decide to remove a profile, back up the data files first. All offline cached content will be deleted when you choose Remove. For more information, see Introduction to Outlook Data Files (.pst and .ost). If you are trapped in a similar situation that my Outlook is not opening, you may feel disturbed about the problem. If Outlook is NOT able to start in safe mode, then try the next proposed solution below, entitled Create a new Outlook profile.

My Outlook won't open. It's an on-going problem. This time, though, when I shut down my laptop, and rebooted it, I am

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 fix MFA prompts not working 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. Here's the deal, when Outlook manages to open, all the files you delete will automatically be recreated. It gets better because you also resolve all the Outlook opening issues. Please follow the steps specified in the below link.

Getting Started Is Easy

Running the /resetnavpane command removes all customizations to the navigation pane. Please go to Create an Outlook profile for steps on how to create a new Outlook profile, then continue with how to use a different profile. With the window with the Windows Update, you will see all the updates you need to make for your Microsoft Office.

Repair corrupt Outlook data files

If you would like for me to fix this issue using our Secure Remote Assistance then customer care can setup a new case for us. Occasionally, that profile can become corrupted. You can determine if it's corrupted by creating a new profile and changing which profile is used when Outlook starts. Use the classic Outlook startup troubleshooter to diagnose and fix several common classic Outlook for Windows issues for you. If you restart it successfully, it will show you that one or more add-ins are defective.



If anyone finds a more permanent solution, I would appreciate it. It seems like something went wrong on Microsoft update and they might recall it or fix it, so we might need to wait untill that. If online repair didn't work, you Fix Outlook Not Opening After Windows Update need to reinstall your Office application.