Outlook/MSN/Hotmail using Mac Mail app

Hi.

Just moved from Norton Internet Security yesterday to Norton 360 Deluxe for my Mac.

When I turn the VPN on I can't access my Hotmail/Outlook mail. My mail app keeps asking for a password and after I enter it I'm asked again in a loop.

As soon as I turn the VPN off I enter the password and it works again.

How do I fix this?

Thanks in advance.

Craig