In many critical IT System, the production account is well protected.  They will only be created on demand and even the username will be a password like string to avoid potential guessing.

How to increase the security even when you use public email system like outlook.com?  For sure, enabling 2 factor authentication is the basic.  But what can we do more to protect our account?  

I suggest to protect our login name by creating email alias in Outlook.com.

With email alias, you can have more than one emails in outlook.com in 1 email account.   The  benefit is that you can separate your login name and daily email.  Hence, the others won’t have your login name.  But of coz’ you won’t give your login email to anybodies.

Here’s the steps to separate your login email and daily emails.

1. Create email alias in Outlook.com.  

Eg your present login is a@outlook.com, you now create b@outlook.com.  I assumed you had given a@outlook.com to your friends and other online systems.  You now create b@outlook.com as your new login email.  Pls don’t give b@outlook.com to others.

https://support.office.com/en-us/article/Add-or-remove-an-email-alias-in-Outlook-com-459b1989-356d-40fa-a689-8f285b13f1f2 

2.Manage which alias as login 

You now make b@outlook.com as your login email by following below steps.

 https://support.microsoft.com/en-us/help/12407  

3.Manage which alias as primary 

The you change b@outlook.com as your primary account.

 https://support.microsoft.com/en-us/help/12407 

4. Change your default send from email 

Finally, you change your default send from email to a@outlook.com so that system will send all emails from a@outlook.com even when you send email in mobile.

http://www.thewindowsclub.com/create-add-use-outlook-email-alias  

Now, you can add b@outlook.com in your mobile as your login!!