One of my new Blackberry users complained that deleted items were not syncing properly on her device. After much troubleshooting and even doing a wipe and reload, I realised what the problem was. She was a shift+deleter in Outlook.
In order for deletions to synchronise to a Blackberry device, you have to use the delete key on it's own, or just move the items into the Deleted Items folder. This is because the BesAdmin account needs to keep track of your messages as you move them around your mailbox, and if you shift+delete it, BesAdmin doesn't know what happened to the item and it does not delete on the device. This is yet another reason why shift and delete is bad, and should be discouraged among Outlook users.
Technorati Tags: Blackberry, Deletions, Sync, Outlook

