Didier Verna <verna(a)inf.enst.fr&gt; writes: Not true. At least not if you do not mix versions. Note that the options loading code generated by 20.4 does check that the version is = 20 and therefore the options file never gets loaded under 21.x Even if this was not the case or if you want to support mixing version you can get away by redefining load-options-file. I thought about writing a migrate.el to convert the old options to custom but it seems to me it is not worth it. Most of the options can simply be copied by loading the old options file by hand once and then doing a save-options. That leaves the hooks stuff and the fonts. The latter is probably too difficult to do automatically and the for just the former it is too much work for too little gain IMHO. Jan