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This has always been a FAQ, so parking here for quick access as well as sharing. Sharing is loving

Article Title: Unread marks synchronization is inconsistent between BlackBerry smartphone and IBM Lotus Notes
Article Number: KB05253
Link: KB05253-Unread marks synchronization is inconsistent between BlackBerry smartphone and IBM Lotus Notes

Cause

This issue is caused by one of the following:

1. The BlackBerry Enterprise Server and the BlackBerry smartphone user do not have Manager and Editor rights.
2. Unread marks replication of the mail database is not configured.
3. A failover between the clustered replicas of the mail databases was performed.
4. Unread marks became inconsistent while the IBM Lotus Notes email application was not running.
5. The BlackBerry Enterprise Server is connecting to a failover messaging server.
6. The BlackBerry smartphone user's mail file version is prior to IBM Lotus Domino 6.0.
7. The canonical name does not match the first item in the User Name field in the Person document.

Additional Information

Article Title: Reconciliation delays in BlackBerry Enterprise Server for IBM Lotus Domino
Article Number: KB15648
Link: http://www.blackberry.com/btsc/KB15648

Source: http://www.blackberryforums.com/bes-...le-timers.html