Get another users's calendar data

Hey,

Is there any possibility to get another user calendar data, his/her appointments for selected period of time?

I know that I can get my appointment items by using Exchange Web Services and code like that below (from http://msdn.microsoft.com/en-us/uc14trainingcourse_5l_topic2.aspx):

1. CalendarView calendarView = new CalendarView(DateTime.Now,      
2.        DateTime.Now.AddDays(numberOfDays));
3.  
4. FindItemsResults<Appointment> appointments = 
5.        _service.FindAppointments(
6.        WellKnownFolderName.Calendar,
7.        calendarView);

But I want now to get not mine but someone calendar data. Is there also posibility to use Exchange Web Services with server-side applications? Or another method without setting user login and password or using default credentials to get calendar items?