By default, the Blackberry will only sync items which are stored in your Inbox wirelessly. If you have set up server-side rules in Outlook to send e-mail to a folder other than Inbox or your move a message from the Inbox to another folder then it will disappear from your Blackberry. Although the Blackberry does have a feature where you can show the folders on the server, it will not sync messages in those folders by default. You must configure the Blackberry to sync alternate folders using the procedure below in order for that to work properly.
Here are instructions to have <a href=”https://www.link2exchange.com/kb/HOWTO%3A_Have_messages_filed_in_Outlook_show_up_on_your_Blackberry.htm”>messages filed in Outlook</a> show up on your Blackberry. (link2exchange.com)