I haven't had much to do with digital certificates. A 3rd part company is requesting that we setup a secure email link using a digital certificate. I have narrowed it down to using a 'Digital ID for Secure Email' from VeriSign. The 3rd party company has a digital certificate that I can download, but I don't know what it's for.
In the 'instructions' that they have sent me, the 2nd step is to "Apply for a personal S/MIME certificate from a trust center and assign is to your e-mail account in the corresponding options of the e-mail software you use."
We are running Windows Server 2003 with Exchange 2003 as well. Any help with this would be greatly appreciated.