Read mail revert to unread

Since a few days, I have several users who have the same problem : all read mails are reverting back to unread when they exit Notes Client and restart the client. If they only close their mail file and reopen it, then it’s OK the read messages are always seen as read but not if they restart the client. These users are on the same clustered server but not all the users on the server have the problem.Where is the “unread list” stored and how is it managed ?

Subject: Technotes…

First:

The Architecture of Unread Marks in Lotus Notes

Unread marks are not exchanged during replication

Unread marks appear correctly on primary mail server but incorrectly on clustered replica

Documents marked read from BlackBerry later appear unread in the Notes client

Unread Mark problems in clustered environments

Number

Document Title

1110573

Unread count for a folder is greater than actual number of unread documents

1091075

Folders do not display the unread mark count as expected on a Notes Client

From the knowledge base

Subject: Thanks for info

there was an agent on the postopen for the database that’s why each documents were reverted to unread