Configuring preferences and options in Outlook.com
Hi Everyone,
Thank you for posting to Microsoft Community. We understand your concerns that you want to stop Outlook.com redirect to ninemsn.com.au after loggin out.
I would like to inform that the possible reason is because this is depends on your local Service Internet Provider ISP. They have their default page and this is also based on the DNS of the service provider.
However you can send your feedback through this link.
Thanks.