We're using Exchange Server 2007 and Windows Server 2003 R2 64-bit with Service Pack 2. Our mailboxes were migrated from Exchange 2000 Server SP3 and Windows 2000.
Exchange Server 2007 comes with a self-signed certificate. The client access server (CAS) role uses the self-signed certificate to connect clients to OWA. No browser, by default, will see this as a valid certificate. The proper solution is to replace the self-signed certificate with a certificate from a trusted certificate authority. For more information, read Microsoft's article on understanding self-signed certificates in Exchange Server 2007.
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