SAN Certificates or UC SSL Certificates provide significant cost savings by securing up to 25-250 Multi-Application or UC Environments/domains with a single SSL certificate. This can simplify situations that would require multiple IP addresses because one IP address per certificate is normally required.
Secure host names on different base domains in one SSL Certificate
Virtually Host Multiple SSL sites on a single IP address
Simplify your Exchange Server SSL configurationThe defining feature of a UC SSL Certificate is the use of the SAN field in the certificate and any number of different domain names or common names (up to 250 for Entrust Wildcard ONLY).
yourdomain.com
mail.yourdomain.com
autodiscover.yourdomain.com
any.word.yourdomain.com
www.someotherdomain.com
www.domainyouown.com