Tips: Cannot open Messaging.

You wake up early in the morning, switch on your device and connect to your home wireless network. As usual, you open the Messaging application to manually download your emails. However, there is no response from the device when you press the email button. It doesn't work in Start > Programs either. How to fix this?
 
Simple. Open File Explorer and locate the following file: Inbox.mst123456789 (Check the storage card). Delete the folder and reboot your device. That's it. You should now be able to access Messaging again to send and receive your emails/SMSs.