Why does My Microsoft Office Outlook Crashes?


Though Microsoft’s desktop email client has improved over time, let’s face it, most of us have a love-hate relationship, thanks to Outlook crashes.

Microsoft’s email management client for students, professionals, and entrepreneurs, provides multiple ways to manage information such as emails, calendar, and other data personal in nature.

Here are a few reasons why your Outlook crashing and how you could get rid of this problem.

Download the Diagnostic

There are certain situations when missing entries in your registry and registry corruption causes this problem. Try running a registry scan to identify if there are any such issues.

  1. Click the button below to download and install the Diagnostic
  2. Perform a Registry scan and fix any problems detected.
  3. Restart your computer.

Estimated Download Time: 10 Seconds

Compact the PST Files

Outlook PST files contain personal data stored by the user. When the size of these files get out of hands, it leads to insufficient space, technical issues, and glitches. You might want to compact these files, i.e. reduce the PST file size.

  1. Open Microsoft Office Outlook.
  2. Click the File menu on the menu bar.
  3. Click the Account Settings | Account Settings.
  4. It opens up a new dialog.
  5. Click the Email tab.
  6. Select the primary email you use, and then click the Change button on the toolbar.
  7. It opens up a new dialog named Microsoft Exchange.
  8. Click the Outlook Data File Settings button under the Cached Exchange Mode Settings.
  9. Click the Compact Now button to start the process.

Disable RSS Feeds To Prevent Outlook Crashes

RSS, an abbreviation of Rich Site Summary, allows syndication of the Web content. Outlook synchronizes your favorite content from Internet Explorer. You might want to disable this feature by configuring the email client settings as under:

  1. Open Microsoft Office Outlook.
  2. Click the File menu.
  3. Click Options.
  4. It opens up a new dialog.
  5. Click the Advanced tab.
  6. Uncheck the below checkbox under the RSS Feeds category:
    • Synchronize RSS Feeds to the Common Feed List (CFL) in Windows
  7. Click OK to save your changes.

Uninstall Conflicting Software

Some users reported conflicts with ShoreTel software that caused Outlook crashes. End this program process and then uninstall it to resolve the issue.

  1. Press Windows Key + X.
  2. Select Task Manager.
  3. Click More Details to expand the user interface.
  4. Click the Processes tab.
  5. Right-click the ShoreTel.exe process, select the End Task option from the context menu, i.e. right-click menu options.
  6. Confirm the action when you’re prompted to do so.
  7. Now, press Windows Key + X, select Programs and Features.
  8. In the new window, right-click ShoreTel and select Uninstall option.
  9. Follow the on-screen instructions and then reboot your computer.

Turn Off Third Party Add-Ins

Add-Ins are unique software programs that add additional features and enhancements to the original program. My recommendation is to start off disabling third party add-ins altogether.

  1. Click the File menu and then select Options.
  2. Click the Add-Ins tab in the new dialog.
  3. Select a type of add-in you’d like to disable in the Manage drop-down box.
  4. Go ahead and click Go.
  5. Disable all third-party add-ins, and then close the dialog.
  6. Exit and restart Microsoft Office Outlook.

Repair Data Files

Outlook stores your email messages, calendar items and tasks in the form of Data Files (.dat). Over time, these files become corrupt and inaccessible. Remove these files and restart Outlook. Worry not, MS Outlook will re-create them again.

  1. Exit Microsoft Office Outlook.
  2. Click the File Explorer icon on the Taskbar.
  3. Click the View tab on the Ribbon.
  4. Check up Hidden items.
  5. Open the following directory:
    • C:\Users\UserName\AppData\Microsoft\Outlook\
  6. Delete the following files: (Right-click and select Delete option)
    • OutCmd.dat
    • FrmCache.dat
    • Forms Views.dat
  7. Restart Outlook to fix Outlook crashes.

Turn Off the Use of Hardware Acceleration

If MS Outlook is misbehaving, there’s a chance its Hardware Acceleration, a GPU rendering feature that enhances hardware encoding/ decoding and processing speed, is incompatible with your system.

  1. Press Windows Key + X, select Run.
  2. Type RegEdit.
  3. Click OK.
  4. Locate the following subkey:
    • HKEY_CURRENT_USER | Software | Microsoft | Office | 15.0 | Common | Graphics
  5. Right-click the Graphics subkey, select New | DWORD (32-Bit) Value.
  6. Specify the following arguments:
    • String Name: DisableHardwareAcceleration
    • String Value: 1
  7. Click OK, and then exit the Registry Editor.
  8. Restart your computer for the changes to take effects.


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