2.0 Success. 
2.1 Success but fallback taken  on one or more property  values. 
2.2 Success, invalid property  ignored. 
2.3 Success, invalid property  parameter ignored.  
2.4 Success, unknown non-  standard property ignored. 
2.5 Success, unknown non  standard property value  ignored. 
2.6 Success, invalid calendar  component ignored.   
2.7 Success, request forwarded  to Calendar User.  
2.8 Success, repeating event  ignored. Scheduled as a  single component. 
2.9 Success, truncated end date  time to date boundary. 
2.10 Success, repeating VTODO  ignored. Scheduled as a  single VTODO. 
2.11 Success, unbounded RRULE  clipped at some finite  number of instances  
3.0 Invalid property name.  
3.1 Invalid property value.  
3.2 Invalid property parameter.   
3.3 Invalid property parameter  value.  
3.4 Invalid calendar component  sequence.   
3.5 Invalid date or time.  
3.6 Invalid rule.  
3.7 Invalid Calendar User.  
3.8 No authority.   
3.9 Unsupported version.   
3.10 Request entity too large. 
3.11 Required component or  property missing. 
3.12 Unknown component or  property found 
3.13 Unsupported component or  property found 
3.14 Unsupported capability  
4.0 Event conflict. Date/time  is busy.  
5.0 Request MAY supported.  
5.1 Service unavailable.  
5.2 Invalid calendar service.  
5.3 No scheduling support for  user. 
