Hello,

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Thanks,
Gary Moore
O365 Forum Moderator

Hello EmmaMc,

From what you've posted, I'd believe that the problem is that your domain contains the word "windows".
Please see the following article, specifically Error message 4: http://support.microsoft.com/kb/2515404
I've responded to you in a private message. If you could reply there, we should be able to help.

Thanks,
Gary Moore
O365 Forum Moderator