Hi, The local folders section suddenly went very narrow, I draged it back to the normal position, but then it took over the entire screen.
Selecting a folder just draws a blue band across the screen. No Emails are visable, and I cannot see any method of returning things to normal.
Any advice most welcome, thanks dave-P

try (and backup the file just in case):

first close kmail then edit ~/.kde[4]/share/config/kmail2rc and remove everything in the [Geometry] section, then restart kmail and the geometry should be reset to the default