Supplementary Requirements

Supplemental system requirements:
 * 1) 99,5% uptime: It is crucial that a calender service has almost no downtime. People depend on their calenders at all times, and it is a core feature of a calendersystem, that you can depend on it.
 * 2) Security: A calender contains private and valuable data, so security is very important. It is not like a map or a computer game. A calender contains private data and HAS to be secure.
 * 3) Cross platform: The main idea behind our calender system is that it should be cross platform. It is this feature that seperates us from the other calender services. So it is an important requirement.