JAVA项目中与Exchange集成问题，在线求解！

Question

项目中需要将个人日程同步到Exchange的日程中去，写了一个测试方法，如下：
public class SynMeetingToExchange {
public static void main(String[] args){ ExchangeService service=new ExchangeService(ExchangeVersion.Exchange2007_SP1);//创建service实例
ExchangeCredentials credentials = new WebCredentials("[email protected]","12345678");
service.setCredentials(credentials);
try {
service.autodiscoverUrl("[email protected]");

Appointment appointment = new  Appointment(service);
appointment.setSubject("会议日程同步到exchange测试，发送时间："+new Date());
appointment.setBody(MessageBody.getMessageBodyFromText("要开会了，请大家注意！"));
SimpleDateFormat formatter = new  SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date startDate = formatter.parse("2012-12-17 12:00:00");
Date endDate = formatter.parse("2012-12-17 14:00:00");
appointment.setStart(startDate);
appointment.setEnd(endDate);  appointment.save();

} catch (Exception e) {
e.printStackTrace();
}
}
}运行上面方法后，在执行service.autodiscoverUrl("[email protected]")这行时，有异常抛出，一直没找到抛异常的原因，还请大家帮助一下，异常如下：microsoft.exchange.webservices.data.AutodiscoverLocalException: The Autodiscover service couldn't be located.
at microsoft.exchange.webservices.data.AutodiscoverService.internalGetLegacyUserSettings(Unknown Source)
at microsoft.exchange.webservices.data.AutodiscoverService.getLegacyUserSettings(Unknown Source)
at microsoft.exchange.webservices.data.AutodiscoverService.internalGetLegacyUserSettings(Unknown Source)
at microsoft.exchange.webservices.data.AutodiscoverService.getUserSettings(Unknown Source)
at microsoft.exchange.webservices.data.ExchangeService.getAutodiscoverUrl(Unknown Source)
at microsoft.exchange.webservices.data.ExchangeService.autodiscoverUrl(Unknown Source)
at microsoft.exchange.webservices.data.ExchangeService.autodiscoverUrl(Unknown Source)
at com.landray.kmss.third.exchange.SynMeetingToExchange.main(SynMeetingToExchange.java:24)有知道原因的，可否给个解答？非常着急，非常谢谢！