Using os 5.0.0.419 on my tour and it works great. Only bad thing is that it is a leaked version downloaded from a web site. Other than that I can tell you it has treaded SMS,quicker start up times,a better video player,and it loads up web pages quicker that before. There are other small details to much to list actually but all in all quite satisfied with this version.http://blackberryrocks.com/2010/01/18/official-os-5-0-0-419-blackberry-tour-9630-mts-mobility-operat...