Please try this later:
(full article is here: https://support.office.com/en-us/article/Set-up-email-using-the-iOS-Mail-app-7e5b180f-bc8f-45cc-8da1-5cefc1e633d1?ui=en-US&rs=en-US&ad=US&fromAR=1)
Use these instructions if you have any @outlook.com, @hotmail.com, @msn.com, @live.com, @outlook.co.uk, or any custom domain email addresses that are hosted on Outlook.com.
Go to your device's Settings, scroll down to Mail, tap Accounts >Add Account.
Note: If you have not updated to iOS 10, go to your device's Settings > Mail, Contacts, Calendars > Add Account.
Device Settings > Mail Add Account
Enter your Outlook.com account email address. Tap Next.
Enter Outlook.com email address
Enter your password ***** with your email account. Tap Sign In.
Enter password ***** sign in
If you're prompted to enter server settings, enter the following and continue.
Email: your full email address.
Username: your full email address.
Password: email account password.
Note: Double-check that everything is spelled correctly.
Outlook may request certain permissions. To agree, tap Yes. Then choose the apps you want your email account to sync with your iOS device and tap Save.
Note: If you're prompted to create a passcode, tap Continue and type a numeric passcode. If you're prompted and don’t set up a passcode, you can’t view this account on your device. But you can set up a passcode later in your settings.
Your email account is now ready for use with the iOS Mail app!