Exactly
four years ago, on January 15th 2001, I released Drupal 1.0.0. The
following snippet is taken directly from the original announcement:

Today, drop.org announces the release
of drupal 1.00 after an extensive period of testing. Drupal is a
full-featured content management/discussion engine using
Apache/PHP/MySQL and suitable to setup a news-driven community or
portal site similar to kuro5hin.org and slashdot.org. Current features
include discussion forums, web-based administration, theme support, an
open submission queue, content management, a modularized design, PHP
sessions, user management with access control and
username/profanity/hostname filters, error logging, a public diary
module, an affiliate site module, backend/headline generation (RSS/RDF)
and much more.