Sorry should have made it clearer!
Switching from 20mbit to 50mbit.
Using Outlook 2k7, settings not changed or anything! Just a simple upgrade to 50mbit.
Any thoughts?
EDIT: More info:
Log onto incoming mail server (POP3): Your e-mail server rejected your login. Verify your user name and password in your account properties. Under Tools, click E-mail accounts. The server responded: -ERR pop operation is not allowed for this user.