Outlook Error Codes

How to Fix Outlook Malicious Code Objects Error When Adding Calendar Events

Muhammad Talha Sep 29, 2026 869 views

Question details

The user encounters an error warning that objects in a form were not loaded to prevent malicious code from running when attempting to add a calendar event.

How to Fix the Outlook Malicious Code Objects Error

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Adding a new calendar event in Microsoft Outlook.
Observed behavior: Outlook displays a security message blocking one or more objects in a form from loading, interrupting the process of creating a calendar event.

Before you start

Before troubleshooting, confirm whether you are using the Windows desktop version of Outlook or Outlook on the web, and save any drafted emails to prevent data loss.

Solution 1Recommended

Disable Third-Party Add-ins in Outlook

Identify and disable non-Microsoft add-ins that might be triggering the malicious code warning during calendar event creation.

Often, the malicious code error is triggered by third-party add-ins conflicting with Outlook's built-in security protocols. Disabling them one by one helps isolate the exact cause.

Open Add-ins Options

Open Outlook and navigate to 'File' > 'Options' > 'Add-ins'.

Manage COM Add-ins

At the bottom of the window, ensure 'COM Add-ins' is selected in the Manage drop-down menu, then click 'Go'.

Disable Add-ins

Uncheck all non-Microsoft add-ins to disable them temporarily, then click 'OK'.

Restart and Test

Restart Outlook and attempt to add a calendar event. If the error is gone, re-enable your add-ins one by one to identify the specific add-in causing the conflict.

Add-in Identification: Once you identify the problematic add-in, consider keeping it disabled or checking the developer's website for an updated version.

Solution 2

Update Microsoft Office

Ensure your Outlook application is running the latest version, as updates often contain security patches and bug fixes for form loading issues.

Solution 3

Review Trust Center Settings

Adjust Trust Center configurations if Outlook's strict security policies are incorrectly blocking safe calendar forms.

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Frequently Asked Questions

Why does Outlook block objects in calendar forms?

Outlook employs strict security measures to prevent malicious scripts from executing automatically. If a custom form or a third-party add-in contains unverified code, Outlook's Trust Center blocks it by default to protect your system from potential threats.

Will disabling add-ins permanently remove them from Outlook?

No, unchecking an add-in in the COM Add-ins menu only disables it temporarily. You can easily re-enable it later by checking the box again if you find it wasn't the cause of the malicious code error.

Is it safe to change Trust Center settings to bypass this error?

It is generally not recommended to lower Trust Center security settings unless you are absolutely sure the calendar form or add-in is from a trusted source. Bypassing these checks can expose your computer to genuine malicious code.

Microsoft Office Error Codes