Windows Mobile Smartphones

I have a Windows Mobile 5 smartphone connected to my desktop PC (Vista) via USB, with Active sync running.
I am after a piece of software that will allow me to type in text messages on my PC and have them sent as SMS (text messages) through my phone.
Can anybody suggest any applications that offer this functionality?

This software (EasyHelper Contacts + SMS Backup) can backup Contacts and SMS to a file. And it can also restore Contacts and SMS from the file. Go to www.easyhelper.net to get more information and download a trial version.