I have an unusual problem.

I registered a my custom domain with Microsoft today and got an outlook account associate with it. I don't have access to the DNS information so I cant do a complete forward of emails but this is fine as I am just doing a manual forward from Gmail ( Google Apps corporate Email" ) I am able to send emails from outlook but using my custom domain and I am receiving emails via forwarding in Gmail. If I try to add this account to my phone or a windows 8 pc using Outlook or Exchange it will not work. I am however able to add it using Hotmail. Why is this and is there any difference ?