Comodo offers a range of X.509 Digital Certificates to help with your fundamental requirements for Internet security.
In response to demand from larger organizations such as multi-nationals and conglomerates we have developed the Enterprise SSL range of SSL Certificates, delivering peace of mind and superior-quality service to high-value projects worldwide. Specifically designed to meet the needs of the enterprise market, all products in this range have a dedicated account manager for ease of access and come with a freephone number for priority support, free site seal and unlimited reissues. And, to minimize the security issues caused by expiring certificates - so vital when considering the scale and value of transactions with organizations of this size - we have set these certificates to have a minimum life of 2 years.

Read this article also: The Value of Authentication & A Guide to Understanding SSL Certificates