Exchange EWS ChangeType always "Created"

Question

We are working on synchronizing our outlook-calendar with our custom web application. We have set up an exchange-server for testing and we are able to get the calendar-items out of the calender. The problem is that the ChangeType is always "Created" (although we changed some-values with the outlook-Client from Microsoft).

The code to get the items is the following:

ChangeCollection<ItemChange> calendarChangeItems = 
service.SyncFolderItems(folderId, PropertySet.FirstClassProperties, null,512, SyncFolderItemsScope.NormalItems, null);

Any ideas?

Answer 1

This link helps me to understand the meaning of SyncFolderItems:

How to get required attendees in SyncFolderItems method

Very important is to keep the SyncState for further synchronisations. Thank you for help.