Our company uses an exchange server (2003 version) to deliver email to employees. Several of these employees also synch their email to their blackberrys using blackberry enterprise server. Both Exchange and Blackberry Enterprise Server are running on the same server, which is running Windows SBS 2003. The issue we are having is that these users are turning on their pcs and getting inbox updates of over 700MB. After the update completes, however, there are no new messages in the box. Fortunately, we have seen that the only users getting this update are those using both Outlook and Blackberry to manage their mail. Could this be the cause, or just a coincidence?