folder modification times

[Matt Price <matt.price@utoronto.ca>]

To: mutt users list <mutt-users@mutt.org>
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Subject: folder modification times not updated?
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Hi everyone,

I've noticed recently that some of my Maildir folders
don't have the right date attached to them. So for instance, one
folder has recently been updated, but ls thinks it hasn't been
modified since dec. 29:
[matt@anarres<501>/home/matt]$ ls -ld Maildir/.moin
drwx------    5 matt     matt         4.0K 2003-12-29 16:16 Maildir/.moin/

On theo ther hand, Maildir itself knows it's been updated recently:
[matt@anarres<502>/home/matt]$ ls -ld Maildir/     
drwx------  125 matt     matt         4.0K 2004-02-04 20:30 Maildir//

What I'd like to know is, why would the modification date be changed
in one case and not the other?  And what can I do to fix this?  

Thanks as always,
matt