Exchange 2010 - interval is missing in Microsoft.Exchange.WebServices.Data.Recurrence.YearlyPattern

Hello everyone,

we currently work with appointments through the exchange web services. We have to handle recurring appointments as well, and everything works fine, except for appointments that occur in a yearly pattern.

When you create an appointment through a client like outlook, you are able to set an interval for a yearly recurring appointment. But this member is not included in the classes we have to work with through the web services: http://msdn.microsoft.com/en-us/library/microsoft.exchange.webservices.data.recurrence.yearlypattern_members(v=exchg.80).aspx

This is, because YearlyPattern is no subclass of IntervalPattern as every other patterntype is:

 http://msdn.microsoft.com/en-us/library/microsoft.exchange.webservices.data.recurrence(v=exchg.80).aspx

Does anybody know, what's the cause of this? Is there a chance to get the interval property? Is there possibly a workaroundwe can use?

Kind regards,

Kai Hartmann