Android

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It would be interesting to know if there is an alternetive to windows mobile...

Android is now coming to stores in mobiles, so it would be a good idea to try running android in our touch viva (opal)

does anyone know if it is possible to do this and how??

Take a look here: http://forum.xda-developers.com/showthread.php?t=462188

In short: It can run, but it's not usable as a complete WM replacement yet. Currently, there's no support for sound, vibration, leds, wifi or bluetooth concerning the Opal.
If you're interested in helping with development, please take a look at the thread I linked, you'll find most of the information there and I'll be more than glad to answer any question not already answered there.
Currently, it looks like I'm the only one working on the Opal side, and lately, I haven't had much time to dedicate for this project.