I was looking on Cisco's site and found the patch for the DST change that is coming up directly. I downloaded the DST patch and will apply it during a window to minimize any possibility of an outage. While I downloaded that patch, I found that there are both OS and patch updates available. Currently our systems are running (CallManager 4.1(3)sr3a and IPCC Express 4.0(4)SR01_Build029). What I am trying to figure out is what is the reccommended version (e.g. does Cisco say that you should be running the latest and greatest) or are they more or less just feature updates that if you are not experiencing issues it is not necessary to update. Also, do I need to update them in any certain order (like you need to be at version X.y1 then upgrade to X.y2 before you can upgrade to x.x1) or can I just download the latest OS release and upgrade to it. I'm just a little bit confused and looking for some clarification before I spend a lot of time rebooting servers and applying patches. Thank you in advance.