EWS: How to update IsRead property of an EmailMessage

how to update IsRead property of an Emai开发者_Python百科lMessage using EWS or other method?

Just setting mail.IsRead=true does not seem to persist.

OK,no one answer my question after I post it for nearly 1 hour which is quite unusual, but I just found a solution. Hope this will help others who get confused on this issue.

mail.IsRead=true;
mail.Update(ConflictResolutionMode.AutoResolve);

That's it. The key is you have to update the item or EmailMessage after setting IsRead property.

A bit late but here is a more detailed code sample:

// if the property is not loaded yet, first load it
mail.Load(PropertySet(BasePropertySet.IdOnly, EmailMessageSchema.IsRead));

if (!mail.IsRead) // check that you don't update and create unneeded traffic
{
  mail.IsRead = true; // mark as read
  mail.Update(ConflictResolutionMode.AutoResolve); // persist changes
}