Windows Mobile 6.5 Pro: Can't start text messaging

Problem: I have a mobile phone running on Windows Mobile 6.5 Professional (A.k.a WinMo Touch version 6.5). One fine day, my phone's text messaging app starts acting weird. Most times, i couldn't even open it.

Cause: The problem lies with Windows Mobile 6.5. You have configured your phone to use storage card to store attachments. This will cause problems as above.

Solution:
1) Go to your text messaging
2) Click 'Menu' -> 'Tools' -> 'Options'
3) Go to the 'Storage' tab
4) Un-check 'When available, use this storage card to store attachments'
5) Soft reset your phone

Warning, the following could result in loss of data. Proceed at your own risk.
Note: If your text messaging app cannot be opened even after a soft reset, then delete the following empty folder in your storage card. 'Inbox.mst****'

Source: http://forum.ppcgeeks.com/htc-vogue/15839-messaging-wont-open.html