The Edit Menu

 
Cut
Currently work in progress.

 
Copy
Copies currently selected text to the clipboard.

 
Paste
Currently work in progress.

 
Delete
Currently work in progress.

 
Select
Currently work in progress, but Ctrl-/ will Select All.

 
Find
Opens the Find dialog box and will locate matching text in the currently selected message.

 
Find Again
Currently work in progress.
Open Browser Using Selected Text
Opens the browser specified as your default web browser in the Advanced Settings using the currently selected text.

Main Menu Bar