outlook.com vs. hotmail.com


New Email
Please help me with the following questions...

What is the difference between hotmail.com and outlook.com?

Do they use the same servers?

Does sending email from an address at one have a better chance of sending than an email sent from the other account?

Which address is safer?

Are there more features in the old or new addresses?

Are there any limitations of one service compared to the other?