since updating to the Exchange 2010 SP3 RU4, users have been experiencing the same issues when working out of shared mailboxes. when user 1 opens an email or manually marks the email as read the status does not change from their perspective, the email remains unread. however, the other users viewing the shared mailbox immediately see the status change to read. User 1 has to re-sort his email from catagory to received or from ect. As soon as the emails are resorted the status changes. alternatively, if User 1 views another folder and returns back. the email is marked as read.
This problem happens with Outlook 2007 and 2010
This happens after re-creating the profile
opening outlook with the switches /cleanprofile /cleanviews seems to solve the problem for an hour or so.
I have run mailbox repairs on the server for the mailboxes in question.
changing the behaviour in tools>options>reading pane> has no effect.