We just replaced our Certificate Authority on the domain with a new server 2008 R2 version. We decommisioned the old server 2003 version. On our Exchange Server 2007 system we now get an error when sending email using POP. The error says "The server you are connected to is using a security certificate that could not be verified. A certificate chain processed, but termicated in a root certificate which is not trusted by the trust provider. Do you want to continue using the server?" Does anyone know how to fix this and correct the certificate that I assuming is not bad/incorrect? We have a Thawte Cert that is enabled for SMTP, POP, IMAP, IIS, and a self signed enabled for SMTP, and a new cert from the new internal CA also enabled for SMTP. Any suggestions?