How to configure your BlackBerry to delete messages on the BlackBerry device and in your Outlook Inbox in a BES environment
One of the simplest configuration checks you should do when having BlackBerry synchronization issues with deletions in a BES environment is to check your reconciliation settings.
First go into the Messages section of your BlackBerry. Then click on the BlackBerry button to access the menu for Messages. Then click on options and select Email Reconciliation which will take you to the appropriate settings. Ensure that the settings look as follows:
Delete On: Mailbox & Handheld
Wireless Reconcile: On
On Conflicts: Mailbox Wins
If these settings aren’t set, then go to each field and change them to match my settings. That should do the trick!