I get the following error when calling the Update() method on an Item in my VB .Net application using EWS (logged on to Exchange 2007 SP1):
Property update did not succeed
What could be the cause?
I'm really hoping this is not due to EWS requiring Exchange 2010 to update categories on an item. The only update I made to the item was to Add a category.
EDIT:
Also, the following code, which makes a copy of the message and updates its category works fine. So it looks like it's only changing the category property for existing messages that's the problem.
Dim itmMessage2 = itmMessage.Copy(itmMessage.ParentFolderId)
itmMessage2.Categories.Add(strCategoryName)
itmMessage2.Update(ConflictResolutionMode.AlwaysOverwrite)
Cheers, Dave