I resisted upgrading to El Capitan because of the negative comments about it, I just wondered about peoples experience of upgrading from OSX 10.8.5 (Mountain Lion I think) to MacOS Sierra? I feel that I should upgrade because of security issues. My main use is Safari, Mac email, Word, Excel and Preview. Apple are only offering me the upgrade to MacOS Sierra, El Capitan and Yosemite do not seem to be available. EDIT: Neither Apple or Firefox are suppling updates for this version of mac.