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Root Certificate Issues

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Root Certificate Issues

I am running Entourage 2004 on an older-model MAC running Mac OS X (10.6.8).  When I boot up Entourage, I get the following error message:

 

"Unable to establish a secure connection to mail.comcast.net because the correct root certificate is not installed.

If you continue, the information you view and send will not be secure."

 

I have tried to reinstall/update the root certificate, which indicates that will not expire until 2020.  Any ideas?