You will find that most Legacy Certification Authority providers are UNIX based and the core technology being used is over ten years old. When they were introduced, UNIX was used as it provided the high level of security that was required at the time. The only problem was that to get this level of security you had to put up with a system that was relatively inflexible.
Our Digi Certification Authority Uses Open Source and Linux
In order to create a certification authority that does not suffer from this problem, our Digi CA was creating using the technology of Open Source and Linux. This means that you will find it easy to change and or customize every aspect of the CA and to be able to do so at very little cost, which are both very important factors to most of our customers today.