 Since Eudora OSE uses an entirely different code base from Classic Eudora, in an effort to reduce the confusion the application was renamed to Eudora OSE (Open Source Edition).The version number was also reset to 1.0, which has the added benefit that it is synchronized with the Penelope version number.Eudora OSE does not retain the original mbox data structure, which stores all attachments as individual files together in one folder.