Problems with Outlook

Hello!

Recently I receive a cpanel mail account and I configurated it in my Iphone and Outlook. Everything was ok until today, when it stoped receiving the mails. If I check webmail, I can see all my correspondence normally, but in my Outlook or phone it seems something is wrong.
Where should I check for problems? Should I reconfigure my account in both outlook and phone?

Thank you very much!! :D