Version: (using KDE 4.3.0) Regression. When I clicked inside message preview in KMail/KDE3 and then I pressed ctrl+a whole message was selected. In KDE4 instead of previewed message, all messages (the list) are selected.
In kmail from kde 4.3.0 to select all the text inside the preview it is now Ctrl+Shift+a (or menu Edit|Select All Text).
please see (and vote for) the bug #204625