Eudora is a major reason my home desktop is still on OS X 10.6. Not mentioned in the article is that Eudora was a multi-window program, modelled after the Maci

Eudora is a major reason my home desktop is still on OS X 10.6. Not mentioned in the article is that Eudora was a multi-window program, modelled after the Macintosh (spatial) Finder, making it easy to see and manage multiple mail folders (typically filter-generated, for mailing lists or important contacts) and messages together. Seemingly every other client imitates Outlook's single peephole view.