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How to Fix OneNote Cannot Open Embedded Outlook MSG Email Files

Huma Ashraf Ch Sep 28, 2026 870 views

Question details

Users are unable to open Outlook MSG email files that are embedded as attachments within Microsoft OneNote.

How to Fix OneNote Cannot Open Embedded Outlook MSG Email Files

Product: Microsoft OneNote, Microsoft Outlook
Device & OS: not provided
Scenario: Attempting to open an embedded Outlook MSG email file directly from a OneNote notebook page.
Observed behavior: The embedded MSG file fails to open and triggers an error, whereas other file types such as Excel, Word, and PDF attachments in the same notebook work correctly.

Before you start

Ensure you have saved any open work in OneNote and Outlook, and verify your system is connected to the internet to allow for software updates or online repairs.

Solution 1Recommended

Update Office and Run the Online Repair Tool

Updating and repairing the Office suite can resolve underlying software conflicts and missing registry keys between OneNote and Outlook.

Since both applications are part of the Microsoft Office ecosystem, a failure in their integration often requires a full repair of the Office suite rather than just OneNote.

Check for Office Updates

Open any Office application (like Word or OneNote), navigate to 'File' > 'Account', click on 'Update Options', and select 'Update Now'.

Open Programs and Features

Press the Windows key, type 'Control Panel', and open it. Navigate to 'Programs' > 'Programs and Features'.

Initiate Online Repair

Right-click your Microsoft Office installation in the list, select 'Change', choose 'Online Repair', and click 'Repair'. Follow the on-screen prompts to complete the process.

Restart Required: You will need to restart your computer after the Online Repair is fully complete before testing the MSG files again.

Solution 2

Test the MSG File in a New OneNote Notebook

Creating a new notebook helps determine if the issue is specific to a corrupted notebook or if it is a system-wide application error.

Solution 3

Gather Diagnostic Information and Escalate

If the issue affects multiple users across the organization despite repairs, it may be a broader compatibility bug requiring administrative intervention.

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Frequently Asked Questions

Why do PDF and Excel files open in OneNote but not MSG files?

MSG files rely on specific Outlook integration protocols to open. If there is a version mismatch, registry error, or compatibility bug specifically between Outlook and OneNote, MSG files will fail to open while standalone file formats like PDF, Excel, and Word continue to work normally.

Will reinstalling just OneNote fix the MSG file issue?

Because OneNote is closely integrated with the rest of the Office suite, reinstalling just the OneNote application might not resolve the problem. It is generally more effective to run a full Online Repair on the entire Microsoft Office suite from the Windows Control Panel.

Is there a workaround if I desperately need to read the email in OneNote?

Yes. As a temporary workaround, you can open the email in Outlook and use the 'Send to OneNote' feature to print the contents directly to a notebook page. Alternatively, you can save the email as a PDF file and attach the PDF to your notebook instead of the MSG file.

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