"Jeyo Mobile Extender adds mobile text messaging capabilities to your Outlook application through a Windows Mobile Smartphone or Pocket PC phone. With this add-on program, you can exchange messages with other mobile phone users anywhere around the world directly from your Outlook. Jeyo Mobile Extender makes text messaging as simple and easy as email."
For me this is a must have application and now it works with Vista and Office 2007. This is the best way I have found to manage and save important SMS messages on your devices. There is a trial version and it is only 19.95USD. Well worth the price in my opinion.