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Digital Signature / Certificate Deployment

Last Modified: 2013-12-12
I have Outlook Add-Ins (DLLs) that I need to deploy to client networks.  I have them digitally signed (Verisign certificate). Our deployment method is that a user launches our program, which checks a server for updates and copies them to the desktop if necessary. The problem is that they get a warning message from Outlook saying that another program is trying to access e-mail (or contacts) and prompts them to allow or not.  If they manually install our certificate from the dll, the message is circumvented.  But having thousands of users do that is not preferable.  

How can I instruct the network administrators to deploy my certificate so that this message doesn't come up?  (Some are using Active Directory, and some not.)

I've read something about certutil, but don't know enough to say whether the following statement is the preferred deployment method:

certutil -addstore root mycert.der

Is there a better way, or is this the best way?  (I also could use Advanced Installer, if that helps.)
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