<p>
SquirrelMail uses the IMAP protocol, info on it can be found
<a href="http://imap.org"/>here</a>. The program also uses
- its own IMAP functions, not those built in to PHP4. This won't
+ its own IMAP functions, not those built in to PHP. This won't
matter to anybody except those responsible for installing it,
but trust us when we say they appreciate it.
</p>