Have a colleague who complains about missing emails. He has a straightforward pop email account (no EXchange or other server-based software in the equation) and uses Outlook 2003 on his pc. He claims that frequently emails will come through to his phone but never appear on his pc. I guess the fact they do go to his phone rules out any ISP/hosting company-based issue, so little point in asking them? He claims has checked for usual spam filters, etc. Any tests or traces I can set up?