Secure Multiple Domain Names with a Single SSL Certificate
SAN cert allows for multiple domain names to be protected with a single certificate.
SAN Certificates are often used for Unified Communications (UC) to secure Microsoft Exchange 2007 Server, Office Communications Server 2007, or Mobile Device Manager. For example, you can secure all these domains with a single SAN Certificate:
www.bizybank.com
www.exchange.bizybank.com
www.bizybank.net
www.new-bizybank.net