error with appointment form to help prevent malicious code from running one or more objects in this form were not loaded

Question

error with appointment form to help prevent malicious code from running one or more objects in this form were not loaded

Shirl Laliberte 20

When i attempt to make a new appointment a message comes up saying "to help prevent malicious code from running one or more objects in this form were not loaded." How do I get the code to run?

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Victor1-V 9,185 Microsoft External Staff Moderator

Hello Shirl Laliberte,

Thank you for your post in the Microsoft Q&A forum.

I understand you are receiving the error "To help prevent malicious code from running, one or more objects in this form were not loaded" when trying to create a new appointment in Outlook, and I can understand the confusion this causes.

This message is a security feature of Outlook designed to protect your system. The goal is not to force any blocked code to run, but to identify and resolve the conflict that is preventing the standard appointment form from loading properly.

This error usually indicates that an add-in or a custom component is interfering with the appointment form. Let's troubleshoot this step by step:

Step 1: Start Outlook in Safe Mode

This helps determine if an add-in is causing the problem.

Close Outlook completely.
Press Windows key + R, type outlook.exe /safe, and press Enter.
In Safe Mode, try to create a new appointment.
- If the error DOES NOT appear in Safe Mode, an add-in is likely the cause. Proceed to Step 2.
- If the error STILL appears in Safe Mode, proceed to Step 3.

Step 2: Disable Add-ins

Close and restart Outlook normally.
Go to File > Options > Add-ins.
At the bottom, next to "Manage:", select COM Add-ins and click Go....
Uncheck the boxes for all add-ins listed and click OK. Restart Outlook.
If the error is gone, re-enable add-ins one at a time, restarting Outlook after each, to identify the problematic one.

Step 3: Clear the Outlook Forms Cache

Disclaimer: Generally, modifying registry subkeys or work group is intended for advanced users, administrators, and IT Professionals. It can help fix some problems, however, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For further protection, first check out How to back up and restore the registry in Windows - Microsoft Support

Close Outlook completely.
Press Windows key + R, type regedit, and press Enter to open the Registry Editor.
Navigate to the following key (you can copy and paste this into the Registry Editor's address bar): HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook (Note: The "16.0" corresponds to Outlook 2016/2019/2021/Microsoft 365. If you have an older version, it might be "15.0" for Outlook 2013 or "14.0" for Outlook 2010).
Look for a subfolder under Outlook named Forms. Right-click on the Forms folder and select Delete.
Close the Registry Editor and restart Outlook. The cache will be rebuilt automatically.

Step 4: Repair your Office Installation

If the issue persists, you can repair the Office installation:

Close all Office applications.
Go to Windows Settings > Apps > Apps & features.
Find your Microsoft Office installation, click on it, and select Modify.
Choose Quick Repair and follow the prompts. If that doesn't work, try Online Repair.

Please try these steps in order and let me know the result at each stage. This information will be crucial for further analysis. I appreciate your patience and cooperation.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

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Shirl Laliberte 20 Reputation points

2025-12-25T11:58:25.19+00:00

Victor I had identified the com yesterday it is icloud. I am going to uninstall icloud and then reinstall. I probably will clear the cache first since you have enlightened me on how to do this.
Shirl Laliberte 20 Reputation points

2025-12-25T13:26:44.97+00:00

Victor I have now uninstalled and reinstalled icloud for windows (after clearing cache in windows registry) and the problem still exists. Bye the way this happened after the last windows update. When I opened outlook on wednesday had the problem.
Shirl Laliberte 20 Reputation points

2025-12-25T13:41:34.58+00:00

Victor I was wondering if I could export the registry key from my husbands registry (he has same setup as I do and is working fine) to my registry?
Victor1-V 9,185 Reputation points Microsoft External Staff Moderator

2025-12-25T14:43:20.2533333+00:00
Hello Shirl Laliberte,

Thank you for the detailed updates and for sharing what you have already tried. I truly appreciate the time and effort you’ve put into isolating this issue.

From your previous comments, it’s now clear that:

The iCloud for Windows integration has been identified as the related component.

Reinstalling iCloud and clearing the cache did not change the behavior.

The issue started after a recent Windows update.

Regarding your question about exporting a registry key, I understand why that idea makes sense, but I must advise against it. Even if two systems appear similar, registry data is often tied to specific user profiles, system identifiers, and update levels. Importing registry keys from another computer can lead to unexpected system or Outlook issues and is not a supported troubleshooting method.

Below is the recommended safe troubleshooting path:

Step 1: Disable only the iCloud Outlook add-in

This helps confirm whether the iCloud Outlook integration itself is the trigger for the security message.

Open Outlook.

Go to File > Options > Add-ins.

At the bottom, next to Manage, select COM Add-ins and click Go….

Locate iCloud Outlook Add-in in the list and uncheck its box.

Click OK and then fully restart Outlook.

Try creating a new appointment.

If the appointment form opens normally after this, the issue is confirmed to be caused specifically by the iCloud Outlook add-in.

Step 2: Test with a new Outlook profile

If the error persists in Step 1, this helps rule out any profile-level corruption that may have been introduced or affected by the system update.

Close Outlook completely.

Open the Control Panel and go to Mail (32-bit) or Mail.

Click Show Profiles….

Click Add…, create a new profile (e.g., "TestProfile"), and add your email account to it.

Set this new profile to be the one used when starting Outlook.

Open Outlook with the new profile and test creating an appointment.

Step 3: Temporary workaround (if Step 1 succeeds)

If disabling the iCloud add-in resolves the issue but you still need iCloud installed for other features:

You can keep the iCloud Outlook Add-in disabled in Outlook’s COM add-ins list for now.

This allows you to use Outlook normally while using iCloud for file or photo syncing.

You can access your iCloud calendar and contacts directly via the iCloud website when needed.

Note Regarding Third-Party Software: Since iCloud for Windows is a third-party application, compatibility can be affected by Windows updates. If the issue is confirmed to be with the enabled add-in, contacting Apple Support may also be beneficial for their side of the compatibility review.

Please let me know the result after trying these steps. Your feedback will help determine the appropriate next steps.
Victor1-V 9,185 Reputation points Microsoft External Staff Moderator

2025-12-26T09:48:58.2166667+00:00

Hello Shirl Laliberte,

I hope you are doing well!

Could you kindly confirm if there have been any recent updates on your side? Have you had a chance to review my latest response?

Please let me know if you need any further assistance. I remain available to assist you further.
Shirl Laliberte 20 Reputation points

2025-12-26T11:21:44.9666667+00:00

Yes Victor I have tried everything you suggested. Unfortunately the calendar integration is the most important item for me. Thanks for all your help. I will now try apple support.
Victor1-V 9,185 Reputation points Microsoft External Staff Moderator

2025-12-26T12:14:36.78+00:00

Hello Shirl Laliberte,

Thank you for the update. I understand that the calendar integration is crucial for you, and it's frustrating that the issue persists.

Since we have tried the possible troubleshooting steps on this forum, and the issue involves a third-party add-in (iCloud), contacting Apple Support is the most appropriate next step.

Please let us know if Apple Support provides a resolution. Your update could be very helpful to other community members.

Thank you for your patience and cooperation.
Shirl Laliberte 20 Reputation points

2025-12-27T12:38:32.8166667+00:00

Victor as a side note I found that if a go to contacts as opposed to calendar and make an appointment from the ribbon on the contact screen it works no error message.
Victor1-V 9,185 Reputation points Microsoft External Staff Moderator

2025-12-27T13:51:28.09+00:00

Hi Shirl Laliberte,

Thank you for the update and for sharing that important workaround.

It's very helpful to know that creating an appointment from the Contacts ribbon works without error. This indicates the issue is isolated to the standard appointment form, which is likely the component affected by the compatibility conflict with the iCloud add-in after the Windows update. Your discovery provides a useful temporary method for others who might encounter this.

Since the issue is specific to the iCloud add-in, contacting Apple Support is the right path for a permanent fix. If you have any further updates after contacting Apple Support, please feel free to let me know.

Thank you again for your collaboration throughout this process.

1 additional answer

Your answer

Shirl Laliberte 20 Reputation points

2025-12-25T11:58:25.19+00:00

Victor I had identified the com yesterday it is icloud. I am going to uninstall icloud and then reinstall. I probably will clear the cache first since you have enlightened me on how to do this.
Shirl Laliberte 20 Reputation points

2025-12-25T13:26:44.97+00:00

Victor I have now uninstalled and reinstalled icloud for windows (after clearing cache in windows registry) and the problem still exists. Bye the way this happened after the last windows update. When I opened outlook on wednesday had the problem.
Shirl Laliberte 20 Reputation points

2025-12-25T13:41:34.58+00:00

Victor I was wondering if I could export the registry key from my husbands registry (he has same setup as I do and is working fine) to my registry?
Victor1-V 9,185 Reputation points Microsoft External Staff Moderator

2025-12-26T09:48:58.2166667+00:00

Hello Shirl Laliberte,

I hope you are doing well!

Could you kindly confirm if there have been any recent updates on your side? Have you had a chance to review my latest response?

Please let me know if you need any further assistance. I remain available to assist you further.
Shirl Laliberte 20 Reputation points

2025-12-26T11:21:44.9666667+00:00

Yes Victor I have tried everything you suggested. Unfortunately the calendar integration is the most important item for me. Thanks for all your help. I will now try apple support.
Victor1-V 9,185 Reputation points Microsoft External Staff Moderator

2025-12-26T12:14:36.78+00:00

Hello Shirl Laliberte,

Thank you for the update. I understand that the calendar integration is crucial for you, and it's frustrating that the issue persists.

Since we have tried the possible troubleshooting steps on this forum, and the issue involves a third-party add-in (iCloud), contacting Apple Support is the most appropriate next step.

Please let us know if Apple Support provides a resolution. Your update could be very helpful to other community members.

Thank you for your patience and cooperation.
Shirl Laliberte 20 Reputation points

2025-12-27T12:38:32.8166667+00:00

Victor as a side note I found that if a go to contacts as opposed to calendar and make an appointment from the ribbon on the contact screen it works no error message.
Victor1-V 9,185 Reputation points Microsoft External Staff Moderator

2025-12-27T13:51:28.09+00:00

Hi Shirl Laliberte,

Thank you for the update and for sharing that important workaround.

It's very helpful to know that creating an appointment from the Contacts ribbon works without error. This indicates the issue is isolated to the standard appointment form, which is likely the component affected by the compatibility conflict with the iCloud add-in after the Windows update. Your discovery provides a useful temporary method for others who might encounter this.

Since the issue is specific to the iCloud add-in, contacting Apple Support is the right path for a permanent fix. If you have any further updates after contacting Apple Support, please feel free to let me know.

Thank you again for your collaboration throughout this process.

Answer 1

Shirl Laliberte 20

Yes Victor I have made a number of comments detailing what I have done. I guess I am not answering correctly. I have added a number of comments.

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error with appointment form to help prevent malicious code from running one or more objects in this form were not loaded

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