IMPORTANT NOTE FOR ADMINS UPGRADING FROM 1.X->2.X!!!

      *) Don't forget to update the database using a script from
         %%DATADIR%%/sql/
      *) Many programs have been renamed and their arguments changed.
      *) Read the upgrading notes.
      *) Don't be careless with this upgrade or mail will be lost!
      *) dbmail can be controled by setting dbmail_imapd_enable,
         dbmail_lmtpd_enable, and/or dbmail_pop3d_enable in
         /etc/rc.conf.