Today, I did something I'd never done before. It was risky and a bit scary, and I don't recommend it as a general procedure for everyone. Yes, I upgraded my Qtek 9100 to AKU2, better known as Windows Mobile 5.0 with the Messaging and Security Feature Pack. What made it risky was that Qtek hasn't provided AKU2 ROM images yet; I upgraded to the images released by I-mate for the K-JAM, which is the same hardware under the hood (same as the HTC Wizard). They only vary in the specifics of the software their vendors bundle on them, with minor differences in features.
If you're interested in why I did this, and how I did it, you can read all about it either online or via Word doc.