pilot-mailsync bugs:
(if/when you find more, please email jochen@pms.garcke.de)

- c-client cannot read POP3 and MH flags (including "seen"). For the Sync-All
  that is not relevant, mail which is not on the palm gets fetched. For
  other options it still applies the following:
  A sync from a POP3 or MH source will transfer all mail not currently on the 
  handheld to the handheld, not only new/recent ones.

  As a workaround, you can use fetchmail to transfer mail to your local machine
  and sync it from there (from a normal mailbox file).

