So your email is forwarded from register.com to your Live account? That should not make any difference this should work, not sure why it is not, what is the error or problem?:How To Get Exchange ActiveSync Working With Hotmail On iPad
To get Exchange ActiveSync working on your iDevice, follow along with the steps below:
1.) On your iDevice, go to Settings > Mail, Contacts, Calendars > Add Account.
2.) Tap on Microsoft Exchange.
3.) Input the following information:
Email: Your Hotmail address ([email protected]
Domain: Leave it blank
Username: Your Hotmail address ([email protected]
Password: Your Hotmail password
Tap on Next. Once the account is verified, a new “Server” field will appear. When it does, input the following:
4.) Now enable push for either Mail, Contacts, or Calendar or all three.
Also note that this method works for @live, @msn, and domains.live.com accounts.