Just found this out via Pocketnow that some folks over at Technology Paradise have managed to extract and port the gorgeous looking Calculator app from HTC HD2 over to all other Windows Mobile based devices. All you have to do now is to download the extracted .cab file and then install it on your phone capable of running Windows Mobile. The Calculator app is suitable for almost all type of Windows phones with any type of resolution (VGA and QVGA) and it also supports both the portrait, and landscape modes.