I have a user who's using Outlook 2010 (Greek) to read his email from a POP3 (perdition in front of an ipop3d / UW-IMAP server). A few days now we're observing the following behavior:
Outlook when started tries to download new email. It (very slowly) downloads headers from all the messages and then starts to download messages. Some messages before finishing the download it fails with error 0x80060040. No new messages are shown to have been downloaded (not even those for which the counter was counting them as downloaded).
In case it matters, the user's .pst lives on an external USB disk and is over 3.5G.