Microsoft Outlook has stopped working

In this guide learn how to fix Microsoft Outlook has stopped working . Microsoft Outlook is one of the most advanced, yet complex email client software. It provides great flexibility by acting as a connectivity tool for much professional software. However, such software or professional Outlook add-ins are not reliable and can lead to improper functioning of the Outlook.

RECOMMENDED: Fix this issue in 3 simple steps. Takes only 2 minutes.
1) Download repair utility.
2) Install program and click Scan button.
3) Click Fix Errors button when scan is completed.
4) Restart your computer.

The Outlook is designed to archive Inbox emails to reduce the mailbox size. However, the mailbox size increases as more and more items are added. Due to this, Outlook struggles to provide a smoother access to user mailboxes and can eventually end up “Not responding”. In addition, the advanced security settings in anti-virus programs can also prevent Outlook in functioning properly.

Microsoft Outlook has stopped working

Some of the common causes of “Outlook Not Responding” error are mentioned below.

  • Not installed the latest windows updates.
  • Outlook may be in use by another process.
  • A previously installed add-in may be interfering with Outlook.
  • You may need to repair your Office programs.
  • Outlook data (.pst or .ost) files may have become corrupt, or damaged.
  • Another program may be conflicting with Outlook.

How to fix Microsoft Outlook has stopped working error?

Follow the below resolution steps one by one and check if the issue gets fix. If the issue remains, you can proceed with the further steps.

Warning : Before making any changes in your computer, I suggest you to create a System Restore point  so that you can restore back your computer to previous working state if something goes wrong.

Method 1: Investigate possible issues with add-ins.

    • Launch outlook in safe mode

press +R in keyboard > type outlook /safe.

    • Go to File > options > Add-ins > select COM Add-ins > Click Go.

Microsoft Outlook has stopped working

  • In COM Add-ins uncheck all the Add-ons and Click OK.

Microsoft Outlook has stopped working

  • Restart outlook in normal mode.

If the issue does not occur, start adding the add-ins one at a time until the issue occurs. This will allow you to figure out which add-in is causing the problem.

Continue with further steps if the error continues.

Method 2: Repair your Outlook Data files.

Repair outlook using scanpst.exe.

Open my computer and select the C:\Program Files (x86)\Microsoft Office\Office14 in 64-bit OS or C:\Program Files\Microsoft Office\Office14 in 32-bit OS

Run scanpst.exe in Administrator mode.

Microsoft Outlook has stopped working

Browse the .pst or .ost file that you want to check and click Start.

If errors are found, you are prompted to start the repair process to fix the errors.

A backup file is created during the repair process. To change the default name or location of this backup file, in the Enter name of backup file box, enter a new name, or click Browse to select the file that you want to use.

Click Repair.

  • Start Outlook with the profile that contains the .pst file that you tried to repair.

If problem not fixed proceed to Method 3.

Method 3: Install the latest updates .

  • Check the latest updates are installed in the windows update.

If problem not fixed proceed to Method 4.

Method 4: Repair Office Program.

Quit all the office programs that are running.
Open control panel > Program and Features (Windows vista or later) or Add or Remove Programs (Windows XP).

In the Programs Click Microsoft Office that is installed and click Repair.

Microsoft Outlook has stopped working

If problem not fixed proceed to Method 5.

Method 5: Make sure Outlook is not in use by another process.

If outlook is using Outlook Auto Archive or sync to other devices will take more resource.

It may conflict the Outlook may not respond.

End the Sync or Auto Archive in the process.

Method 6: Check any .dll files causing the issue.

To check any .dll files causing the problem.

Open Event Viewer by pressing +r in the keyboard and type eventvwr.

In windows log > Application > check the latest outlook error > double click open the log to see the error causing any .dll files.

If it cause by .dll replace the .dll by renaming to .old and replace with new one.


All the above methods will help to fix the problem in Outlook “Outlook not Responding”. If none of these works then it means that your Outlook Data file got corrupt. In that case try the advance utility Stellar Phoenix Outlook PST Repair, which will be effective to resolve the error.

Arun Prabhakar

Arun Prabhakar immensely interested in following Windows and other technology developments. Being passionate Windows blogger, he loves to help others on fixing their computer issues.