Office Apps Freezing

Fix Outlook Freezes When Opening or Attaching Files

Maira Mehtab Sep 22, 2026 869 views

Question details

The user needs to resolve an issue where Microsoft Outlook becomes unresponsive when interacting with email attachments.

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Trying to open a received email attachment or attempting to attach a file to a new outgoing email.
Observed behavior: The Outlook application freezes completely, preventing the user from managing attachments or continuing their work.

Before you start

Ensure you have saved any ongoing work in other Microsoft Office applications, and check if your organization's IT department is already managing system updates before you begin troubleshooting.

Solution 1Recommended

Start Outlook in Safe Mode and Disable Add-ins

Running Outlook in Safe Mode helps determine if a third-party add-in is causing the application to freeze when handling attachments.

Many freezing issues in Microsoft Outlook are caused by outdated or conflicting COM add-ins. Booting into Safe Mode bypasses these extensions, allowing you to isolate and disable the problematic ones.

Launch Safe Mode

Press the Windows Key + R to open the Run dialog box. Type 'outlook.exe /safe' and press Enter to start Outlook in Safe Mode.

Test Attachment Behavior

Try opening or attaching a file while in Safe Mode. If it works without freezing, proceed to the next step to disable your add-ins permanently.

Navigate to Add-ins Settings

Click on 'File' in the top-left corner, select 'Options', and then click on 'Add-ins' from the left sidebar.

Disable COM Add-ins

At the bottom of the window, ensure 'COM Add-ins' is selected in the Manage dropdown, and click 'Go'. Uncheck all the boxes to disable the add-ins, then click 'OK' and restart Outlook normally.

Re-enable Add-ins Safely: If disabling all add-ins fixes the issue, try turning them back on one by one to identify the exact extension causing the freeze.

Solution 2

Run an Online Repair for Microsoft Office

Use the built-in Windows repair tool to fix corrupted Microsoft Office installation files that might be causing Outlook to crash.

Solution 3

Create a New Outlook Profile

A corrupted user profile can lead to application instability. Creating a fresh profile can restore normal attachment functionality.

Free Microsoft Office alternative

Switch to WPS Office for a Seamless, Freeze-Free Experience

If Microsoft Office applications frequently freeze or use up too much of your system's resources, consider switching to WPS Office. It is a highly compatible, lightweight, and free alternative designed to keep your productivity high without the frustrating crashes.

1. Download the Installer: Visit the official WPS Office website and click the download button for your operating system.
2. Install WPS Office: Run the downloaded installation package and follow the quick setup wizard to complete the installation.
3. Open Your Office Files: Launch WPS Office and easily open your existing Microsoft Office documents without any formatting loss.

Fully compatible with Microsoft Word, Excel, and PowerPoint formats.Lightweight software architecture that runs smoothly without freezing on older devices.Familiar user interface requiring zero learning curve for a seamless migration.Completely free to use for basic document creation, editing, and sharing tasks.

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Frequently Asked Questions

Can my antivirus software cause Outlook attachment freezing?

Yes, aggressive antivirus programs scan incoming and outgoing attachments in real time. If the software gets stuck scanning a file, Outlook will freeze. Temporarily disabling the email scanning feature can help you identify if the antivirus is the root cause.

How do I turn off attachment previews in Outlook to prevent crashes?

You can turn off previews by opening Outlook and navigating to File > Options > Trust Center > Trust Center Settings > Attachment Handling. Check the box that says 'Turn off Attachment Preview'. This prevents Outlook from rendering files before opening them, saving resources.

Why does Outlook freeze only when I try to attach large files?

Large files require more memory and processing power to upload to the email server. If your computer lacks sufficient RAM, or if the file exceeds your organization's attachment size limit, Outlook may struggle to process the request and temporarily hang or freeze.

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