What is the difference between a Java certificate and a vba certificate?

Question

I already have a Verisign certificate for signing Java code. To support the Java application, I wrote an Outlook macro and I want to sign it. This does not work using a Java certificate. Can anyone tell me if:

a) there is a way to use a valid Verisign Java certificate to sign vba code and
b) if not, what technical difference makes the language of certificates specific.

I just ask how to pay for the same amount again for another Verisign certificate, a bit sluggish for a few lines of vba code.

Answer 1

Certificates can have various extensions. The most common one for code signing is pretty general. However, it seems that on some platforms certain extensions are required.

Some certificate providers, for example, you buy one certificate for each platform. I assume that they do not contain any necessary extensions. It seems like another seems to just need one certificate to subscribe to multiple platforms: https://secure.ksoftware.net/code_signing.html