Upgrade experience.

[patric conant]

Had a 16 year-old jr. admin do an upgrade to the border
router/firewall/content-filter/web-proxy/etc from the CD, entirely painless
and clear process, could not have been more straight-forward, the upgrade
guides were excellent, as an assurance, in 5 minutes + file
copying/downloading time upgrade from 4.7 to 4.8 was complete, ditto for
4.8. to 4.9.