If you have applied the latest Microsoft update this may have altered settings in your Outlook.
By going to your account settings you may see the following:
Incoming Server: mail.hosts.net.nz
Outgoing Server mail.hosts.net.nz
Please replace this with the correct servers:
Incoming Server: mailx.freeparking.co.nz
Outgoing Server: mailx.freeparking.co.nz
More infomation on port numbers and Outlook settings can be found here if required: