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How to fix my email signature on outlook 365 it is no longer working. Stopped after update.

Wayne Larkin 5 Reputation points
2025-12-03T06:32:12.22+00:00

My signature in Outlook is no longer working this only just happened. I have tried many suggested fixes but none are working. I use Windows 365 - it does not say on Outlook if it is Classic or Not. How do I identify that.

Outlook | Windows | Classic Outlook for Windows | For home
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  1. AI answer

    2025-12-03T06:33:20.77+00:00

    To fix your email signature issue in Outlook 365, you can follow these steps:

    1. Check for Special Characters: Sometimes, special characters in your signature can cause issues. Try removing any special characters and keep your signature simple.
    2. Recreate Your Signature: If your signature is still not working, you can try deleting it and creating a new one:
      • Go to File > Options > Mail > Signatures.
      • Delete the existing signature and create a new one.
    3. Update Outlook: Ensure that your Outlook is up to date. Sometimes, updates can fix bugs related to signatures.
    4. Check for Add-ins: Some add-ins may interfere with the signature functionality. You can start Outlook in safe mode to see if the issue persists:
      • Press Windows + R, type Outlook /safe, and press Enter. If the signature works in safe mode, consider disabling add-ins.
    5. Repair Office: If none of the above steps work, you might want to repair your Office installation:
      • Open Control Panel, click on Uninstall a program, find your Office installation, right-click it, and select Change > Online Repair.

    To identify whether you are using Classic Outlook or the new Outlook for Windows, you can look for the following:

    • Classic Outlook typically has a more traditional interface and may not have some of the newer features found in the updated version.
    • You can also check the version by going to File > Office Account > About Outlook. This will show you the version number, which can help you determine if it's Classic or not.

    If you continue to experience issues, consider reaching out to Microsoft Support for further assistance.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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  2. Chloe-L 13,665 Reputation points Microsoft External Staff Moderator
    2025-12-03T18:58:36.22+00:00

    Hello Wayne Larkin,

    Thank you for posting your question to Microsoft Q&A. I understand how frustrating it is when a routine feature like your email signature stops working, especially right after an update.

    Since the troubleshooting steps differ significantly between the "Classic" version of Outlook and the "New Outlook," we first need to confirm exactly which version is currently running on your Windows 365 environment.

    Please look at the top-right corner of your Outlook window. Do you see a toggle switch that says "Try the new Outlook"?

    User's image

    • If the toggle is On (colored), you are using the New Outlook.
    • If the toggle is Off or missing, you are likely on Classic Outlook.

    Alternatively, if your app icon looks like number one, you are likely using the New Outlook, if your app looks like number 2, you are using the Classic Outlook.

    User's image

    Could you please reply with a screenshot of your Outlook window, or let me know which of the above matches your screen?

    Once I know this, I can provide you with the specific fix to restore your signature immediately.

    Best regards,

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