What is a Multiple Domain (UCC) SSL Certificate?
2018-06-11 ONE NET WIKI
A Unified Communications Certificate (UCC) is an SSL certificate that secures multiple domain names and multiple host names within a domain name.
A UCC lets you secure a primary domain name and up to 99 additional Subject Alternative Names (SANs) in a single certificate.
UCCs are ideal for Microsoft® Exchange Server 2007, Exchange Server 2010, and Microsoft Live® Communications Server.
UCC certs allow you to use a single ssl certificate in a shared host environment so they are also ideal in situations where the number of ip addresses are limited. For instance, if you have 10 sites with differing domains or host names, and only one ip address to use among them and you want them to have ssl digital certificate protection, then a multi domain ucc ssl certificate is ideal for this situation.
In a shared hosting environment, the UC Certificate "Issued To" will only list the primary domain (but the site seal can list the remaining domains in the SAN). Please be aware that any other or secondary domains will be listed in the UCC SSL certificate as well. If you do not want domains or sites to appear related to each other via the ssl certificate details, you should not use this type of certificate.