IMAP stealing mail??

[David Loszewski]

K, i'm using imap-uw on my mailserver and am using horde and
squirrelmail on my webserver.  Once I grab my mail using one of these
webmail clients it's as if it's actually popping the mail from the
mailserver instead of just imapping it so when i go to my desktop mail
client it says I have no mail yet unless I have not used the webmail
client for a while, if you go to the webmail client it shows a ton of
mail, what's the deal?

Dave