I assume that you are wanting to map button 1 (the mail hard key). You will need a shortcut to Text messages. I have uploaded the a shortcut for you. Just Drop the
Text Messages.lnk in the
Windows\Start Menu\Programs. Now just tap on the start menu and go to
Start->Settings->Personal->Buttons and change the program assosiated with Button 1 to Text Messages
The exact shortcut to text message is below and is case sensitive.
Code:
\windows\tmail.exe -service "SMS"