All my users are on a single Exchange server and use Outlook,OWA and ActiveSync to connect. There is a third party SSL certificate on this server that uses the name "mail.mycompany.com".
I've just installed Exchange 2010 on a new server that will coexist with the existing 2003 server for a few weeks while I get everyone moved over. I'm just about to order a new SAN certificate, but was wondering about the name "mail.mycompany.com". Since it is currently being used on the 2003 server, can I go ahead and order the new SAN certificate, which will include "mail.mycompany.com"(which will point to the new server after I change my NAT policy to point to the new server) without any ill effects on the current server?
Basically just wondering if I order this new cert, will it somehow invalidate the current certificate being used on the 2003 server because both certs will reference "mail.mycompany.com"....?