Vista - "check for messages in all folders" option doesn't seem to work

Using IMAP4 with Windows Mail on Vista. The checkbox to "check for
messages in all folders" doesn't seem to work. More specifically, I
don't want to check all folders (other than the inbox) when I send and
receive, so I have that unchecked. But every time Windows Mail goes
to send and receive, and I look at the details, it's downloading not
only all the headers from the messages in all folders, but the content
as well. So it not only disregards the config option to not check all
folders, but it's downloading the body of the message as well, which
is entirely contrary to the fundamental premise of IMAP. So really,
it seems like Windows Mail has some serious flaws with IMAP4. Anybody
else notice this?

Steve