I have a web server that serves up about 6 HTTPS (host header) sites using a wildcard certificate which works fine but it is expiring soon so am looking into the possibility of using a SAN certificate. I do not quite understand what the SAN based ones are but from what I understand, they are for multiple domains. In theory, I think this would also work for host header based sites but wanted to verify before spending the money. I also have a couple of other domains that use SSL including an Exchange CAS server for Activesync.
Will a SAN cert work and can someone point me to a document explaining how they work?