a. Require Application Add-ins to be signed by Trusted Publisher
If you check this box, the Trust Center will make sure that the add-in uses a trusted publisher's signature. If the publisher's signature hasn't been trusted, the Office program won't load the add-in, and the Trust Bar will show a message that the add-in has been turned off. After you change this option, you must restart Office.
b. Disable notification for unsigned add-ins
Disable notification for unsigned add-ins (code will stay disabled): This option is no longer grayed out when you check the box that says "Require Application Extensions to be signed by a Trusted Publisher." Add-ins signed by a trusted publisher are turned on, but add-ins that haven't been signed are turned off. After you change this option, you must restart Office.
c. Disable all Application Add-ins
Disable all application add-ins (this may affect how the program works): Check this box if you don't trust any of the add-ins. All of the add-ins are turned off without any warning, and the other boxes for add-ins are grayed out. After you change this option, you must restart Office.
Further explanation:What is an add-in for VSTO?
You can use VSTO Add-ins to automate Microsoft Office applications, add more features to them, and change how they look to the user.
To turn on a VSTO Add-in again
- Click the File tab inside the app.
- Click on the button that says Application Name Options.
- Click Add-ins in the list of groups.
- Check that the VSTO Add-in is on the list of Disabled Application Add-ins in the details pane.
- Click Disabled Items in the box that says Manage, and then click Go.
- What makes COM and VSTO add-ins different from Office add-ins?
What makes COM and VSTO add-ins different from Office Add-ins?
COM or VSTO add-ins are older ways to integrate Office that only work on Windows and Office. Office Add-ins are different from COM add-ins in that they don't run code on the user's device or in the Office client.
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