The IMAP protocols don't, per se, but Outlook adds one (that's local
to Outlook's IMAP PST) and can perform junk processing on the IMAP
account's Inbox. If a message gets moved to the Junk E-mail folder
you see in the IMAP PST, it will be on Outlok only, I believe. I
don't think Outlook will create a Junk E-mail folder that can be seen
on the server side. I can't test on Outlook 2007, right now, but
that's the way Outlook 2003 handles it. I know, however, there were
significant changes in Outlook 2007's IMAP handling, so perhaps it has
been changed.

In my case, it does create the Junk mail folder on the server side.

++Hector C.