We have an Exchange 2010 Server (V 14.3 Build 123.4) with Outlook 2010 Clients (and no others).
Single Server, no replicas.
We are using mail enabled public folders, with the option "Maintain per-user read and unread Information" enabled.
This works as expected, but randomly emails that were already read are set to unread again (this happens per user).
I did not find a matching solution for this. All other threads use replicas or Outlook 2011 Mac clients, so this does not fit our issue.