Today I recived this error in Outlook on one of my users computers:
Task ‘mail.somedomain123.com – Receiving’ reported error (0×800CCC90) :
‘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).
The server responded: —————————————————–’
Apparently Outlook had a problem retrieving one of the messages, but after deleting it from the webmail Outlook had no problems retriving mail again!