Eudora Releases

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Eudora OSE is an email client that combines Mozilla's Thunderbird with code, features, and GUI elements from Qualcomm's Eudora. See the home page for more information.

Eudora OSE 1.0

The first release of Eudora OSE, version 1.0 (which includes the Penelope extension) is now available for download. Use the links below to download. Please see the README for information on how to submit bug reports and new feature requests.

All of these links simply redirect to so we must assume that qualcomm no longer distribute the installers.

Eudora OSE 1.0 is based on the Thunderbird 3.0.4 source code, so add-ons that do not work with Thunderbird 3.0.4 likely will not work with this version.

Installation Note

Windows users upgrading from Penelope 0.1a19 have things pretty easy, but there's an extra step: uninstall Thunderbird, install Eudora OSE, start Eudora, go into the Tools/Add-ons menu item and uninstall Penelope a19. Upon restarting Eudora the version of Penelope that came with it will automatically be reinstalled.

NOTE: many add-ons that worked with Eudora beta 1 won't work with beta 2 (or later, as of 2/8/08). It's a smart idea to do a full backup of all your mailboxes and preferences files before doing the upgrade, as "in place" upgrades may have problems.


For user-based support of Eudora OSE please go to: There is no knows OSE support forum.

Mozilla does not provide support for Eudora OSE or the Penelope add-on.

Mac Eudora OSE users, please see for important information about Mac Eudora and OS X Lion. This applies to the Mac Eudora importers inside Eudora OSE as well as the Classic Mac Eudora.