Starting last Thursday, one of my email accounts started having INTERMITTENT errors when doing SEND/RECEIVE with Outlook. The problem was with the RECEIVE, as the SEND worked fine. I was using Outlook 2003. I upgraded to Office 2013, and the problem was still there.
The problem was intermittent. I would say that about 1 in 10 times, it worked fine.
The error was:
Task 'info@NorthernColoradoRentals?.com - Receiving' reported error (0x800CCC90): 'Your incoming (POP3) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'
Turns out the ONLY WAY I was able to get the problem resolved was to "disconnect" that email account from going through POPFILE. My other 2 email accounts going through POPFILE continue to work fine.