UI Style
From MozillaWiki
Penelope adds a new settings panel, appropriately called 'Penelope':
This panel presents 2 options; Shortcuts (http://wiki.mozilla.org/Eudora_Keybindings Key Bindings) to use and the UI style.
"UI Style" [edit]
The 3-Pane (MDI like) style will be most familiar to Windows Eudora users. This is essentially the same as the standard Thunderbird interface, with a 'docked' mailbox list along the left side, and a 2-pane message list and message preview on the right side.
The 2-Pane interface causes mailboxes to open in a similar manner to Mac Eudora; 2-pane message list and message preview. The list of mailboxes will open in a separate window. This interface will likely be bothersome for Windows users as Penelope does not support the same MDI interface that Windows Eudora does. As a result, each of the open windows is listed individually on the Task Bar. Mac users might find this interface to be more like Mac Eudora.
(feel free to add more)
