Blackberry Messages Flooding Inbox

One user was getting hundreds of messages an hour in her inbox.  The messages all seemed to be BlackBerry system messages.  Usually these are processed and never seen by the user.  See the example message below...

Subject: RIM_bca28a80-e9c0-11d1-87fe-00600811c6a2

This message is used to carry data between the BlackBerry handheld and an associated server. Please do not delete, move or respond to this message - it will be processed by the server.

ENDETP -1164262116

There was also an attachment called ETP.DAT.

I tried resending services books and removing/recreating the mail accounts on the BlackBerry device.  Eventually I stubmled upon the answer relating to the Desktop Software. 

We recently migrated from an Exchange / BES environment to a GoogleApps environment using the BIS system for mobile email.  Since the BIS is email-only, we had been using the BlackBerry Desktop Manager to synchronize the Tasks/Notes to the device (GSYNC handled Contacts/Calendar). 

The solution was to go to the Add/Remove Programs control panel.  Select the BlackBerry Desktop Software and choose to Modify the installation.  Make sure to select personal email and NOT the Enterprise option (misleadingly called "Work Email" in this version of the software).  I re-sync'd the device and checked email... no more RIM messages!