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Can't limit access to shared calendar through impersonation using EWS

We're using EWS to integrate our CRM with Exchange Online 2010SP2. One of the tasks: provide one calendar for Sales persons with the next rule: every Sales can see all appointments in Scheduler, but can open and see details (body) only his/her own appointment. Appointment are being placed by CRM in response of certain business events. We tried to use impersonate and Sensitivity.Private property. Appointment is being placed with impersonated user name, but it can't be opened by that user neither through OWA nor via Outlook. So it's placed as private appointment of 'master' user (user who created shared calendar and his credentials is used for service connection), he can open it in Outlook or OWA. EWSEditor shows appointment's LastModifiedUser - correct impersonated username (not master's). In Fiddler we can see 'success' Response on appointment placement request (under impersonated user). In OutlookSpy, we can see that appointments PR_SENDER_NAME_W, PR_SENT_REPRESENTING_NAME_W properties shows 'master's' username. We stuck.
Impersonated user has 'owner' rights upon that shared calendar.
If Impersonating doesn't resolve this issue, can Delegate technique do that?
Thanks in advance for any help.
static void Main(string[] args)
{
ExchangeService services = new
ExchangeService(ExchangeVersion.Exchange2010_SP2);
services.Credentials = new WebCredentials("master#exchserver.com",
"MasterPwd");
services.Url = new Uri("https://someserver.com/ews/exchange.asmx");
FolderId rfRootFolderid = new FolderId(WellKnownFolderName.Calendar);
FolderView fvFolderView = new FolderView(100);
DateTime startDate = DateTime.Now.AddDays(1);
DateTime endDate;
string SalesCalendarId = "AAMkADVlMGVjZWVkLT....AADo8XAAA=";
CalendarFolder folder = CalendarFolder.Bind(services, new
FolderId(SalesCalendarId));
TimeSpan ts = new TimeSpan(10, 00, 0);
startDate = startDate.Date + ts;
endDate = startDate.AddMinutes(60);
services.HttpHeaders.Add("X-AnchorMailbox","impersonateduser#exchserver.com");
appointment.Subject = "from Test";
appointment.Body = "Test";
appointment.Start = startDate;
appointment.End = appointment.Start.AddMinutes(30);
appointment.ReminderDueBy = appointment.Start.AddHours(1);
appointment.Sensitivity = Sensitivity.Private;
ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, "impersonateduser#exchserver.com");
appointment.Save(SalesCalendarId, SendInvitationsMode.SendToNone);
}

You could use impersonated user to obtain ‘owner’ permissions.
Please include the code below before services.Credentials = new WebCredentials("master#exchserver.com", "MasterPwd")
services.PreAuthenticate = true;
you need to make sure that we have required permissions for EWS Impersonation as per the article mentioned below:
Configuring Exchange Impersonation in Exchange 2010
Using Exchange Impersonation in Exchange 2010
You could reference the following link:
Get all calendar events for a specific user

Is it possible to directly open the Outlook meeting window?

I am trying to have my application to open the Outlook meeting window with some pre-populated fields.
I have found that this question was already asked here.
However, the code provided in the answer(which works fine) doesn't open the meeting window but the appointement window. Those are two different things that are handled differently in Outlook and what I need is indeed the meeting window.
Is there any way to achieve this or do I absolutely have to open the appointement window first and then invite people to turn it into a meeting?

Create an appointment just as in the other question, but then set the MeetingStatus property of the appointment.
Microsoft.Office.Interop.Outlook.Application outlookApplication = new Microsoft.Office.Interop.Outlook.Application(); ;
Microsoft.Office.Interop.Outlook.AppointmentItem appointmentItem = (Microsoft.Office.Interop.Outlook.AppointmentItem)outlookApplication.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olAppointmentItem);
// This line was added
appointmentItem.MeetingStatus = Microsoft.Office.Interop.Outlook.OlMeetingStatus.olMeeting;
appointmentItem.Subject = "Meeting Subject";
appointmentItem.Body = "The body of the meeting";
appointmentItem.Location = "Room #1";
appointmentItem.Start = DateTime.Now;
appointmentItem.Recipients.Add("test#test.com");
appointmentItem.End = DateTime.Now.AddHours(1);
appointmentItem.ReminderSet = true;
appointmentItem.ReminderMinutesBeforeStart = 15;
appointmentItem.Importance = Microsoft.Office.Interop.Outlook.OlImportance.olImportanceHigh;
appointmentItem.BusyStatus = Microsoft.Office.Interop.Outlook.OlBusyStatus.olBusy;
appointmentItem.Recipients.ResolveAll();
appointmentItem.Display(true);

One more note to NineBerries good solution, because I had an issue here:
The line
appointmentItem.Recipients.ResolveAll();
is necessary if you have optional attendees in the meeting.
Otherwise they will be reset to "required" even if you set
recipient.Type = Microsoft.Office.Interop.Outlook.OlMeetingRecipientType.olOptional;
before, which is due to "late auto-resolving" of names in Outlook (or so it seems).

Creating appointment on Exchange server calendar as other user without impersonation (EWS)

I am creating simple app for appointments scheduling and I want to implement ability for me to create appointments for my users.
I managed to create,update and delete my calendar on Exchange Server, and I somewhat managed to create appointments adding my colleagues as RequiredAttendees like so:
//service variable is being created using my credidentals
Appointment meeting = new Appointment(service);
meeting.Subject = "Some subject ";
meeting.Body = "Some body.";
meeting.Start = DateTime.Now;
meeting.End = meeting.Start.AddHours(4);
meeting.Location = "Some Location";
meeting.RequiredAttendees.Add("myCollegue#mail.com");
meeting.ReminderMinutesBeforeStart = 60;
meeting.Save(new FolderId(WellKnownFolderName.Calendar,
"myCollegue#mail.com"),
SendInvitationsMode.SendToAllAndSaveCopy);
But it is just setting him as required attendee. Next thing is I tried using impersonation, but I can't access hosting server to set myself as master and others to have to share calendar with me (due to permissions and stuff) so I had to scrape that as well. Also, he set me up to be his publishing author on his calendar.
Is there something I am missing, or can't seem to find on MSDN sites?
EDIT: I am able to create appointment in his calendar in outlok.

If anyone comes across same issues as I did in here please follow these steps:
Make sure that person for which you are creating appointment sets you up (on exchange server or in outlok as "Editing author" with all permissions.
After that you can create appointments for him (verify this by going to your outlok and creating some test appointments).
This code works for me:
Folder inboxFolder = Folder.Bind(service, new FolderId(WellKnownFolderName.Calendar, "your.colleague#company.com"));
Appointment appointmentOther = new Appointment(service);
appointmentOther.Subject = "Test 2";
appointmentOther.Body = "Body text";
appointmentOther.Start = DateTime.Now;
appointmentOther.End = DateTime.Today.AddHours(16);
appointmentOther.Location = "My Office";
appointmentOther.IsReminderSet = true;
appointmentOther.ReminderMinutesBeforeStart = 30;
appointmentOther.Save(inboxFolder.Id,SendInvitationsMode.SendToNone);
Good luck :)

Outlook appointment on Server not working

I have created Following function to set Outlook appointment. It's work fine while running in localhost with visual Studio Editor.
But when I upload publish files on server its not working.
Do I need to set anything in server for Outlook or need to include any additional dll/files?
Any help will be appreciated. Pls let me know, if need more information.
public void OutLookReminder(string DateTimeVal)
{
Outlook.Application outlookApp = new Outlook.Application(); // creates new outlook app
Outlook.AppointmentItem oAppointment = (Outlook.AppointmentItem)outlookApp.CreateItem(Outlook.OlItemType.olAppointmentItem); // creates a new appointment
oAppointment.Subject = "........Subject"; // set the subject
oAppointment.Body = "--------Body"; // set the body
oAppointment.Location = "-------Location"; // set the location
oAppointment.Start = DateTime.ParseExact(DateTimeVal, "dd/MM/yyyy H:mm",null); // Set the start date
oAppointment.End = DateTime.ParseExact(DateTimeVal, "dd/MM/yyyy H:mm", null); // End date
oAppointment.ReminderSet = true; // Set the reminder
oAppointment.ReminderMinutesBeforeStart = 15; // reminder time
oAppointment.Importance = Outlook.OlImportance.olImportanceHigh; // appointment importance
oAppointment.BusyStatus = Outlook.OlBusyStatus.olBusy;
// save the appointment
oAppointment.Save();
}

Do you mean you are running this under a service (such as IIS)? You cannot do that.
Where is the appointment supposed to be created? Current user who is using your code in a browser (then your code needs to run locally in JavaScript)?

RemoveExtendedProperty throws error when used on an occurrence of a recurring appointment

I am developing an application that syncs an exchange calendar to another calendar. I put extended properties on the exchange appointments in order to preserve the mapping between appointments in the two calendars. Everything is working fine until I try to remove an extended property from an occurrence of a recurring appointment. When I try doing this, I get the error:
The delete action is not supported for this property.
Here is a code snippet that demonstrates the error:
public void ExchangeTest()
{
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2007_SP1)
{
Credentials = new NetworkCredential("username", "password", "domain")
};
service.AutodiscoverUrl("username#domain.com");
Appointment appt = new Appointment(service)
{
Recurrence = new Recurrence.DailyPattern(DateTime.Now, 2) { NumberOfOccurrences = 3},
Start = DateTime.Now,
End = DateTime.Now.AddHours(2),
Subject = "Test Appointment"
};
NameResolutionCollection resolutionCollection = service.ResolveName("username", ResolveNameSearchLocation.DirectoryOnly, false);
string mailboxAddress = resolutionCollection.First().Mailbox.Address;
FolderId folderId = new FolderId(WellKnownFolderName.Calendar, mailboxAddress);
appt.Save(folderId);
PropertySet properties = new PropertySet(AppointmentSchema.ICalUid);
appt.Load(properties);
CalendarView view = new CalendarView(DateTime.Today, DateTime.Today.AddDays(8)){PropertySet = properties};
IEnumerable<Appointment> occurrences = service.FindAppointments(folderId, view)
.Where(a => a.ICalUid == appt.ICalUid);
ExtendedPropertyDefinition definition = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.PublicStrings, "TestProperty", MapiPropertyType.String);
Appointment firstOccurrence = occurrences.First();
firstOccurrence.SetExtendedProperty(definition, "test");
firstOccurrence.Update(ConflictResolutionMode.AutoResolve);
//The error occurs on the next line.
firstOccurrence.RemoveExtendedProperty(definition);
firstOccurrence.Update(ConflictResolutionMode.AutoResolve);
//clean up
appt.Delete(DeleteMode.HardDelete);
}
It appears that the error is only thrown for an Exchange 2007 server (It works on 2010). Am I doing something wrong, or is this a problem with Exchange? Is there a way to work around this issue? Any help will be appreciated.

I ended up not using the RemoveExtendedProperty function. Instead, I worked around it by just setting the property again, but setting it to an empty space. I then handled the empty space in code. This appears to be a problem with Exchange or the managed API.

Did you try;
appointment.Delete(DeleteMode.SoftDelete,SendCancellationsMode.SendToAllAndSaveCopy);