Outlook is a personal information manager from Microsoft. It is widely used as an email client application but has various smart integrated features such as calendar, task management, contact management, add-ins and many more.

Quite often many users report that they are facing issues with Microsoft Outlook, no matter if it was the latest installation or an old one. Like any other application, Outlook also has some issues and bugs of which some are known and have been fixed while there may be some which have not received required attention yet.

One of the known common issues with Outlook is that it closes unexpectedly sometimes.

There are various issues which can be encountered by any Outlook user while working or just after opening the application itself such as Outlook has stopped working, crashing on startup, crashing in safe mode, Outlook not responding, Outlook crashing while sending emails or loading profile, and crashes because of rundll32 / olmapi32.dll / kernelbase.dll / wwlib.dll / ntdll.dll.

Though there could be many reasons behind why Outlook crashes or why it is crashing on your PC, in this article, we’ll walk you through a couple of issues and the outright solution of each issue respectively.

Why might Outlook be Closing Unexpectedly?

There are many possible reasons for this issue, and we have listed down a few of the common ones below:

  • Corruption of Outlook PST iles
  • Virus or malware Infection
  • Incorrect Windows registry file
  • Compatibility issues
  • Crashes while trying to upgrade to the latest version
  • Too many Add-ins can cause Outlook crash

Uninstall Microsoft Office 2016 & install again

If your Outlook installation is a part of Microsoft’s Office suite and you face crashing issues or encounter Outlook has stopped working message, uninstalling Office 2016 & reinstalling it again might solve the issue. Doing this has helped many users follow the steps below:

  1. Go to Control Panel, and click on Programs and Features.
  2. Select Microsoft Office, right-click, and click Uninstall.
  3. Once Office uninstallation is complete, install it again and check if the issue still exists.

Check your Security Software

System Security tools and software like McAfee, Avast, Avira, etc. Cause issues with Outlook due to some specific settings which you’ve set as per your preference or came enabled by default.

Try disabling the security software/antivirus tool temporarily and check if it helps or not; in most of the cases it turns out that the Security / Antivirus tool was the sole reason causing the tool from working. In case if the issue is fixed, you can uninstall antivirus/security software then.

Remove Outlook accounts and add again

For some cases, the issue might be with your Outlook emails accounts, and there is no way to confirm it straight. As, if the problem is with Outlook data file (OST or PST) then the file won’t remain accessible due to corruption or specific damage to the file structure and integrity.

Removing all your Outlook mail accounts may solve the problem; follow the steps below to do so:

  1. Press + S key, type Control Panel, and press Enter.
  1. Select Mail (Microsoft Outlook 2016) and click on Email Accounts..
  1. Now here, select and remove Outlook accounts one-by-one.
  2. Restart PC and add the accounts again and check if the issues are gone or not.

Disable Hardware Acceleration Functionality

Hardware acceleration is often used by most of the newest applications for Windows. To enhance the overall experience of Outlook, disabling the option of Hardware Acceleration available in the application would come to be a savior.

Follow the steps below for disabling hardware acceleration:

  1. Launch Outlook.
  2. Click on File tab < click Options.
  3. Click Advanced, check Disable Hardware graphics acceleration and click OK.
  1. For the change to take effect, close the application and start Outlook again.

Disable All Outlook Add-ins

If you have installed Add-ins in Outlook to bring the extra features and functionality to boost the productivity and workflow, then you might need to disable all the Outlook Add-ins currently installed. For most of the Outlook users, this is found as a common issue existed amongst all.

Follow the steps below to disable Outlook Add-ins:

  1. Open Outlook.
  2. Click on File tab, click Options, and select Add-ins.
  1. In the new sub-menu windows, click Go, deselect all the active Add-ins, and click OK.
  1. Now, close Outlook and restart it and check if the issues are solved.

If Outlook doesn’t start at all, try launching it in Safe Mode; follow the below steps:

Press and hold CTRL and run Outlook, this combination will trigger the command for Outlook to open in Safe Mode. Many users commonly report Kaspersky Anti-Spam add-on as causing the issue, and so disabling it solved the issue for them.

Disable Host IPS on MacAfee Antivirus Software

If MacAfee Antivirus software is installed on your system, then you should know that some of its features may cause crash problems. Below are the steps to follow to fix this issue:

  1. Right-click MacAfee antivirus software icon present in the system tray on your Windows machine.
  2. Right-click MacAfee antivirus software icon present in the system tray on your Windows machine.

It might bother you, but you have to repeat this process every time you start your Windows machine. This solution has been working successfully for most of the users.

Above concerns are the most common which are talked amongst many Outlook users and hopefully, by following the respective steps you would be able to fix the issues.

Kernel for Outlook PST Repair

Outlook PST Repair tool by Kernel is a professional tool that resolves problems or concerns regarding Outlook PST data file.

You can use this tool to migrate from the Outlook email client to different email clients with ease of accessibility and simplicity of operations. Also, with the tool, you can repair the corrupt or damaged Outlook PST file and recover data with the same file structure and folder hierarchy as of the original file.


Above listed are the issues which came to be the most common, which are encountered by many Microsoft Outlook users, and because of these issues, Outlook was closing unexpectedly. There was no loss of data due to these problems, but it was certainly a headache, and we’ve addressed all of the above problems with the most appropriate solutions.