Connect your device to your desktop software. Double click backup/restore and then click on the advanced tab. Highlight your messages in the right hand pane and click the left arrow to bring it over to the left hand pane. Click File and Save your backup. Now, highlight the messages in the right hand pane again and click on clear. Leave the software up, disconnect the BB and pull the battery for 30 seconds and when the BB loads up, all messages should be gone including the corrupt one. Connect the BB again to USB and with the advanced windows still open, highlight the messages you backed up in the left hand pane, click the right arrow to bring them back, click ok to restore. All of your message should restore except the corrupt one. If you do see it there when the messages are restored, you will now be able to delete it. Let me know. Worked for me 3 times now.