VSTO Signed, but still get confirm prompt at install

Question

I develop a VSTO addon for Outlook. I sign the addon with a certificate purchased with Verisign Inc. The cert is valid and authorized by a trusted root authority. But when my cu

Answer 1

No, the prompt isn't mandatory, but it sounds like either 1) your code isn't actually signed, even though you think it is (you should be able to verify that by right clicking on the compiled DLL and examining the security tab) 2) The Cert isn't the right kind of cert (there are different kinds of certs, I believe the one you need is called a "Code Signing" cert. 3) Maybe there's an older version on the customer's machine that's still being loaded (and hence prompting)?

But short answer is, with the right cert, properly signed and properly installed, the user won't get the prompt.