Exchange Certificate expired

We currently eperiencing a problem with our exchange server 2010 . its issuing an error that the certificate has expired, The said certificate is issued by our Domain Controller(2008 r2). how do we renew the certificate.
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You have to make sure your CA is up and running, then you go through exchange and renew the certificate.
Brad BouchardInformation Systems Security OfficerCommented:
I'd recommend using a 3rd party CA instead of self signed/issued certs.  This is the simplest guide I've found to creating and implementing one yet.

First go get a cert from, then follow this:

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