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
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