See Installing Symantec Endpoint Protection Manager.
Issue: The certificate in use on your Exchange 2003 server has expired and needs to be renewed or replaced.
First, you must install the intermediate certificate to your Microsoft® Exchange Server 2013.
You also can download the intermediate certificate from the repository.
Step 02: Renewing the Certificate Let’s right click on the certificate that is about to expire and then click on Renew Exchange Certificate..When the certificate changes on the server, the trust relationship is broken and clients no longer can communicate. If the management server you want to update replicates with other management servers, break the replication relationship.See Disabling replication and restoring replication before and after an upgrade.Microsoft is conducting an online survey to understand your opinion of the Technet Web site.If you choose to participate, the online survey will be presented to you when you leave the Technet Web site. See Update the server certificate on the management server without breaking communications with the client.* You only need to perform these steps if you use replication in your Symantec Endpoint Protection Manager environment. Disable secure communications between the server and the clients.When you disable the verification, the clients stay connected while the server updates the server certificate.After you enter the CSR in our online application, and once your certificate is ready for installation, you need to download all of the files we provide.You must install the intermediate and primary certificate to your Microsoft® Exchange server 2010 to complete installation.