Outlook 2010 & 2013 Digital Certificate - your digital ID Name cannon be found by the underlying security system

We have a digital certificate that we would process and import into our certificate store. This was working on exchange 2007 with outlook 2010 and outlook 2013 clients.

We migrated to a new Exchange 2007 server and the digital ID's will not process.

I have tried to import using the certificate import wizard, I have tried in both Outlook 2010 and 2013 using trust settings.

Could there be a group policy blocking me?
could there be an exchange setting that is not passing it through?
Simple question is the secure e-mail is being sent to us from a website. Does it need installed on exchange 2007?

Thanks in advance.
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David Johnson, CD, MVPOwnerCommented:
have you gone to a machine that will use this digital certificate and imported the certificate into your certificate store?  Is it signed by the companies root CA? do you have the root ca certificate in your trusted publishers store?

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