Version:           unspecified (using KDE 4.7.2) 
OS:                Linux

(Initially reported as https://bugzilla.novell.com/show_bug.cgi?id=725555 )

I'm using the tabbed interface in KMail.
(You can enable it in prefererences - appearance - message list - show
subwindow bar only if needed (german: "Unterfensterleiste für die
Nachrichtenliste nur bei Bedarf anzeigen") <-- _remove_ the checkmark) 

When I switch between tabs, the message preview area is not updated - it still
shows the last viewed mail from the previously used tab.
I have to select another mail to update the message preview area.

FYI: This is a regression compared to the "good old"[tm] kmail1 from KDE 4.6.x.

Reproducible: Always

Steps to Reproduce:
1. open at least two tabs in kmail and select different folders
2. select a mail
3. switch to the other tab

Actual Results:  
the mail from the previous tab/folder is still displayed

Expected Results:  
display mail from current tab/folder