Textr gives your Windows Mobile PDA Phone/Pro SMS Chat. There are different versions for Windows Mobile 5 and 6.

I really love threaded SMS clients, or apps that let you keep track of your text messages by listing them down like in an IM chat window. Which is why I've written about this feature, whether built-in or added-on, so many times:

• TxtMan: The Treo's Legendary SMS App on Your Windows Mobile 5.0 Gadget
• SMS Chat For Your Symbian S60 Gadget
• The Treo Messaging Client: A Lover's Lifesaver
• The Treo 750: The Most User-Friendly Windows Mobile Device Ever

Most of the players are similar to the original Treo prototype: The messages in a conversation are listed on the top, while the user can type in his reply below. smileys are usually just a tap or two away. So now the question is: how does a SMS chat product differentiate itself? Textr is different, but only because it's the only text client I know that runs on Windows Mobile 6.

By the way, the app is free to try for 21 days. The full version costs $14.95. Download Textr.