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Unable to edit signature in Outlook 2016: FIXED!

Are you unable to edit your signature in Outlook 2016?

Last year Microsoft released an update for Outlook, which addressed some security issues and risks.

The security update fixed and improved vulnerabilities in Microsoft Office. The main fix was to stop an issue that could potentially allow remote code to open a dangerous office file. There is a full report on the file called ‘CVE-108-0791’ here.

Although fixing this issue another problem occurred. Outlook users who are required to switch between email signatures or wanted to add a new signature found the program would not respond and simply freeze and crash. Also, users trying to access the stationary and Fonts windows would also be stopped.

Thankfully a fix has been found! With Microsoft identifying the cause. The update seemed to duplicate the app installed on the user’s machine, meaning both Outlook and the Windows app store version of Outlook were installed. This was mainly happening for users who gained a new computer with Office already installed, but then installed their own copy of Office.

But there is a fix. Please watch the video below and follow the steps on how to fix your Outlook signature.

If you are unable to play the video, please find the steps outlined below:

Step 1:

Open Outlook and compose a new email

Step 2:

Attempt to insert or edit an existing signature, if the program freezes and crashed. You need to fix your Outlook.

Step 3:

In your taskbar search for ‘Settings’ and click the result

Step 4:

Click the ‘Apps’ section in Settings

Step 5:

In the search box, look for ‘Microsoft Office Desktop Apps’

Step 6:

Uninstall this program, as it is a duplicate of Outlook

Step 7:

Now reload Outlook and signatures will work again!

Having trouble with email spam and phishing dangers?

We’ve just released our new software ‘SecureIT’ – a platform that actively trains users on how to avoid phishing dangers and spot fake emails before they do damage to your organisation.

Visit our overview page here or watch our quick introductory video:

Next steps?

If after reading this and are worried about the type of emails you receive. Then please get in contact with us on 02920 887 362 or send us an email at

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