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How to digitally sign a VBA project

I am trying to add a digital signature to a  VBA project that is to be used by internal users.  I am using the signature to prevent the security warning, without having to lower the security settings.  I setup CA on our Windows 2003 server, imported it on my machine withing IE.  I open a test vba project and attempt to add th digital signature.  At this point the only warning I see is when I look at the details of the certificate from within the VBA project is 'All the intended purposes of this certificate could not be verified.'  At this point I try to save the project and get an error:
'There was a problem with the digital certificate.  VBA project in the file ... could not be signed.  The signature will be disgarded.
Is this a problem with the certificate itself.  Do I need to generate a specific type?  If so, how?
Thanks
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byundt
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Brad,
First thanks for all the info.  We have about 200 users.  I was really hoping to create our own CA.  I'll review the information and see if it helps.
Thanks again for all the details.
-Ron