After creating the account you may ask user to login and accept terms and conditions.
Also their will be an account reset question for your users, which will be asked at first login.
Quick Tip: If you are now able to receive emails to your newly set up email accounts then make sure that there is no other MX records pointing to @ or the naked domain.
I have recently got a chance to log into someone else’s account and fix the issue.
Make sure you have the required permissions to recover items in this folder, and try again.You may also change this setting later, but who want to do that! In the next step, you will be ask to setup domain administrator.[A domain administrator will be responsible for all activity in the Outlook custom domain account].Follow these simple steps to setup Microsoft outlook custom domain for email hosting.This is still free and can be used for unlimited users.To verify domain name you will need to goto your domain registrar and add some records.