There is no evidence of hackers. The FOIA file was likely assembled by CRU internally in response to a FOIA request and inadvertently left on an open ftp site when it couldn't be emailed as an attachment. CRU was already revealed as careless in their alleged AGW research and data archiving. Less plausible, an FOIA-protected whistle blower may have released the file.
bloody hero
I agree with your opinion that the leak was not the result of a hacker. However, our quasi-forensic examination of the FOIA/mail folder indicates that the emails were directly copied from the CRU SMTP mail server, not an email client folder someone was preparing for an FOI request.