installation of wildcard SSL certificate

[dgsohard]

I am trying to install an SSL wildcard certificate on Zimbra 7.1.1 using this guide: Preexisting Certifcate Installation for Zimbra 6.0 - Zimbra :: Wiki

I have the following:

• A wildcard SSL certificate
• An intermediate CA certificate
• the CSR for the *.domain
• the public cert of the CA which issued the CSR
• the public cert of the commercial CA issuing the wildcard SSL certificate

Now I got a bit stuck on the names of the certificates and what exactly they are referencing:

• AddTrustExternalCARoot.crt: the public cert of the commercial CA issuing the wildcard SSL certificate?
• UTNAddTrustServerCA: intermediate CA certificate?
• domain.com.crt: wildcard SSL certificate?
• domain.com.key: what is this (the CSR for the *.domain?)

Can someone help me please get this right?

By the way, we got our certificate from RapidSSL.