iCloud: Set up iCloud Mail on your devices
After you set up an @icloud.com email address for your iCloud account on a device, iCloud Mail is ready to use on that device. To use iCloud Mail on other devices, you must turn it on on each of those devices.
On your Mac
Choose Apple menu > About This Mac, then note your OS X version.
It should say “Version 10.7.5” or later.
Open iCloud preferences, then sign in with either your Apple ID (the one you use with iCloud) or your @icloud.com email address.
Turn on Mail (or Mail & Notes in OS X v10.7.5).
On your iOS device
Your device must have iOS 5 or later installed.
Go to Settings > iCloud, then sign in with either your Apple ID or your @icloud.com email address.
Tap to turn on Mail.
On your Windows computer
You can set up Microsoft Outlook 2007 or later for iCloud Mail on your Windows computer.
Install iCloud for Windows if it isn’t already installed on your computer.
Open iCloud for Windows, turn on Mail, Contacts, Calendars, & Tasks, then click Apply.
Your iCloud Mail account is listed in the folder pane (also called the navigation pane) on the left side of Microsoft Outlook.
To view your iCloud Mail folders in Microsoft Outlook, click the disclosure triangle to the left of your iCloud email account.