Installed the 4.0 Desktop software. Installed the 4.0 handheld software. Took about 17 minutes total to do a full backup, upgrade, and restore. Not all my apps restored, but I was able to just ota them. My instant message client did not work initially, but was fixed by the steps on their website. Browser and everything else worked great. Installed the 7100x theme, really nice. On the plus I do see some web pages displaying better. On the minus side I'm pretty sure the maximum volume of my bluetooth headset has lowered. People complain of not being able to hear me sometimes now, and that was never a problem before. Major disapointment to learn that even with 4.0 I could not open .jpg files as an email attachment.