Apache 2.0 has a new way of handling ErrorDocument that will mean much more customizable error messages, rather than the same old boring "Document Not Found" errors.
In you Apache 2.0 default configuration file, you will see the following:
<IfModule mod_negotiation.c>
<IfModule mod_include.c>
Alias /error/ "@@ServerRoot@@/error/"
<Directory "@@ServerRoot@@/error">
AllowOverride None
Options IncludesNoExec
AddOutputFilter Includes html
AddHandler type-map var
Order allow,deny
Allow from all
LanguagePriority en es de fr
ForceLanguagePriority Prefer Fallback
</Directory>