If you ever want to delete your entire Evolution account, history, configuration, settings, etc and start over from scratch, here’s how to do it:

Back up all of your files first (of course).
$ rm -rf ~/.evolution
$ rm -rf ~/.gconf/apps/evolution
$ evolution --force-shutdown

Find the process id for ‘gconfd’ and kill it:
$ ps -ef|grep gconfd
yourusername 30515 1 0 13:24 ? 00:00:00 /usr/libexec/gconfd-2 12
$ kill 30515

Restart Evolution and you should be prompted to set up your acccount.