~/Maildir/.MailingList/cur
Here are all Mails from years 2005 till 2008

I want to move the Mails from here to Maildir.subfolder 2008:
~/Maildir/MailingList.2008/cur$

for each mail X in current dir do
    if date of file contains "2008" M X {
      mv X ~/Maildir/MailingList.2008/cur$
    }
  }