Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running. If so, wait a short time (usually two or three minutes) to see if Outlook starts working again.



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. Should you decide to remove a profile, back up the data files first.

There are problems starting Outlook. How about we start with just the basics?

Find solutions to common problems or get help from a support agent. 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. If you can't choose any of the menu options, type inside an email message, calendar event, or contact, Outlook may have frozen. There are three steps you can take to try to get Outlook working again. With the window with the Windows Update, you will see all the updates you need to make for your Microsoft Office. Compatibility mode is suitable for older software with Windows 10 that fail to run normally.

Microsoft 365 Outlook Won't Open: Troubleshooting Tips

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. 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. You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally. 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.

• Running the /resetnavpane command removes all customizations to the navigation pane.
• Sorry to hear you're having problems, my name is David, and I will do everything I can to help you find the information you need.
• For more information, see Introduction to Outlook Data Files (.pst and .ost).

Make sure you have permissions for PST file

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, you can manage all these problems yourself. Knowing the cause of the problem will help you sort out all the issues related to Outlook opening. Outlook stores all your email messages, meetings and events, contacts, and tasks in data files. You Reset Cached Exchange Mode can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors.

Do you see the message "This set of folders could not be opened"?

A well-running Outlook will ensure that you enjoy the full benefits of this popular email program. If you follow the above solutions, your Outlook will perform according to your expectations. If the in-box Program cannot fix the corrupted Outlook PST files, you can also try Wondershare Repairit for Email. It is a powerful and almighty software that can be applied to fix corrupt Outlook PST files in any scenarios. Hello, you have reached JustAnswer.com, thank you for utilizing our service. My fix MFA prompts not working goal is to provide you with excellent service.

If this isn't what you were looking for, please respond and we can continue to troubleshoot until we find the right answer. Welcome to JustAnswer.com, an independent, paid-support, question & answer service that is not affiliated with any other company. Sorry to hear you're having problems, my name is David, and I will do everything I can to help you find the information you need. Running the /resetnavpane command removes all customizations to the navigation pane.



This goes to prove that the problem came from your original Outlook profile. If you are figuring out how to fix "Outlook Not Opening," you will find several possible solutions. The best part is that you are spoiled for choice because some are quick to implement while others are recreate Outlook profile step by step time-consuming. This section introduces solutions that you can use when Outlook 2016 or Outlook 2013 is not opening.



Microsoft Outlook provides a better experience for users. With great functionality, you can manage your email, contacts, calendar as you like. Check the solutions to fix "Outlook not opening" problem and how to avoid "Outlook won't open" again.



Click the above link to have a quick download, then you can have Outlook errors fixed within minutes. A vast community of Microsoft Office365 users that are working together to support the product and others. I understand that your Office applications are not working.