I upgraded from 7 to 10 last year on my laptop. I lost my Norton Security and my Windows Live Mail 2011. Norton was able to fix the security issue. I came to the Community for help with the email problem. Using a suggestion from the community, I used "repair" all Live Essentials, and my Windows Live Mail was again working. Coming into this month, it has suddenly stopped working again with a message basically saying, program could not open, maybe not enough memory(not the case) and maybe is installed incorrectly. I am very hesitant to upgrade my PC to 10 because of this issue. I do not want to completely lose my emails. I do like 10 quite a lot with the exception of my email issue.