OK I have a 2003 Small Business Server and am using Exchange. I am currently still running ver Nod32 ver 2.7. I have a seperate anti-spam solution I am pleased with. What is the most compelling reason you can think of for me to upgrade to 4.2? I upgraded a while back and ended up going back to 2.7 due to issues with product support on SBS for 4.2 (now resolved). I have been wating for things to stabilize before I take the plung again. I see 4.3 is in beta so the changes keep comming.