Hi. I just recently purchased an HTC Pro Touch2 from T-Mobile running WinMo 6.5. That being said, I have not been able to open any cab files on the device to install some software. Basically I'll transfer the cab to the device and attem pt to open it. I get one of three messages depenidng on the app I guess. the most basic is "Installation was unsuccessful" to "Installation was unsuccessful. The program or setting...not digitally signed...trusted certificate" (this was from MobileFTPClient). Installing Opera Mini 5 gives a simple: "Installation of mini5wm.cab was unsuccessful". Ok, so being a software developer for 10 years I've been looking into some registry values and can't seem to find what I need to get anything to install. If I download from the Windows Marketplace that's all good, but nothing else. What do I need to do to be able to install cab flils directly? Honestly if I can't get this to work this phone is going back. I moved from an iPhone to this phone specifically so I can install apps and monkey around with the device, but so far I'm done before I started. Thanks for any info you can give me.