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This is Tim with Microsoft Office 365 SharePoint Support.
If you have moved all your content from your Office Live to your Office 365 website, the website will be at the default location of http://<domain>.sharepoint.com. If you have added a custom domain to your subscription, you will need to change the website address through the domains area in the Administration Portal. Please see the screen shot below for further assistance.
If you are still seeing issues, please provide me with your domain and I will see what I can find out. I will continue to monitor this thread and wait for your reply.
Microsoft Office 365 SharePoint Support