boot from a live cd then startup shell (terminal) (applications , accessories, terminal)

then type in

gksudo nautilus

then click view, show hidden files and tick it

insert your usb thumb drive and copy the directory called

.evolution

and

.gconf/apps/evolution

and

.gnome2_private/Evolution (this directory may not exist)

copy all those to your usb thumb drive. replace the hdd. reinstall ubuntu. reinstall these directory's from usb thumb drive.

sorted