Question: I have the following code:

(Meeting beeing the exchange appointment)

```
For Each Recipient As String In emailAdresses 
    For i As Integer = 0 To Meeting.RequiredAttendees.Count - 1
        If (Meeting.RequiredAttendees(i).Address).ToUpper() = Recipient.ToUpper() Then
            Meeting.RequiredAttendees.RemoveAt(i)
            Exit For
        End If
    Next
Next

Meeting.Update(ConflictResolutionMode.AutoResolve, SendInvitationsOrCancellationsMode.SendOnlyToChanged)

```

Now as you can see i'm using SendInvitationsOrCancellationsMode.SendOnlyToChanged.

But even though that i'm using that mode it is still sending the appointment to all of the attendees.

I've looked at [msdn](http://msdn.microsoft.com/en-us/library/exchange/dd633620%28v=exchg.80%29.aspx) and the code is exactly the same. And msdn tells me the following should happen: 

> 
> Save the meeting and send a meeting cancellation message to the attendee or attendees that you removed
> 
> 
> 

So basically msdn sais it is works but it does not. Is there a work around for this issue or is anyone else experiencing the same problem?

our exchange server is a 2007 SP1 version.

The answer can be in C# or VB.NET, I'll translate it to the language we need.

PS. Adding members and using this mode causes the invite to send to the newly added member only. But as I said before deleting does not have this same behaviour.

Answer: 
Doing:

```
Meeting.Update(ConflictResolutionMode.NeverOverwrite, SendInvitationsOrCancellationsMode.SendOnlyToChanged)

```

Instead of:

```
Meeting.Update(ConflictResolutionMode.AutoResolve, SendInvitationsOrCancellationsMode.SendOnlyToChanged)

```

Solved my problem, I do not know why and what it was having trouble with though.
Using `ConflictResolutionMode.AutoResolve` instead of `ConflictResolutionMode.NeverOverwrite` did not work for me. After some research, I found out that this is the normal behaviour. 

The [`SendInvitationsOrCancellationsMode`](https://msdn.microsoft.com/en-us/library/microsoft.exchange.webservices.data.sendinvitationsorcancellationsmode%28v=exchg.80%29.aspx) enum's values `SendOnlyToChanged` and `SendToChangedAndSaveCopy` behave similarly when it comes to sending email (the only difference is that the latter saves a copy of the sent email and the former doesn't): 

> 
> Send meeting invitations/cancellations only to attendees that have
>  been added or modified 
> 
> 
> 

There is no reference to attendees that have been removed. I thought that the work 'modified' here means that, but apparently that is not the case. 

This [Microsoft Support Article](https://support.microsoft.com/en-us/kb/2873493) (Article ID: 2873493) says that this is the expected behaviour:

> 
> **EWS issue: SentToChangeAndSaveCopy parameter in Appointment.Update
>  method does not work**
> 
> 
> **Symptoms** 
> 
> 
> 
> > 
> > Consider the following scenario:
> > 
> > 
> > * You build an Exchange Web Services (EWS) application to update a meeting request in a Microsoft Exchange Server 2010 environment.
> > * One or more invitees in the meeting request are externals or distribution lists.
> > * You use the **Appointment.Update** method together with the **SentToChangeAndSaveCopy** parameter to remove one invitee from the
> >  meeting request and to update the meeting request.
> > 
> > 
> > In this scenario, **a meeting update is sent to all invitees**.
> > 
> > 
> > 
> 
> 
> **Cause**
> 
> 
> 
> > 
> > **This behavior is expected.**
> > 
> > 
> > 
> 
> 
>