We have several huge mail or mail-in databases which a group of people are working with.
Every user needs the unread marks to support its daily business and track their progress.
We 've seen many problems in clustered environment to replicate changes at unread mark table to a cluster mate replica of these mail or mail-in databases.
Enhancements and improvements for the unread marks and exchanging them within clustered systems and locally are highly welcome to support our customers much better in their daily business.
Even for the administrator it is hard to track the issues and errors. Some tools to compare the status of a unread mark table for different replicas of the same application will maybe help there.
So the front and backend features for unread marks should be checked for this enhancement request.