Com e-mail address from anywhere. Which means you can read, write, forward, and save drafts of any iCloud e-mails, and its all done throughout the web. The great thing about it approach is that allows a user to control and use iCloud.com e-mail without requiring a Mac, iPhone, or iPad, since the internet based client is accessible from any device on any OS, a Windows Personal Computer or Android device included.
The only thing checking iCloud Email remotely requires is a somewhat modern browser, which can be run on basically any OS. Apart from that, so long as you created an iCloud.com e-mail account at some point in time with the associated Apple ID, it'll be available to access and use from simply about anywhere.
The way to Access iCloud. The iCloud Mail web client is full featured, you could send, reply, forward, trash, flag, archive, and compose new e-mail messages straight from the iCloud.com Mail website. Since iCloud Mail is linked to your Apple ID, you will even have full access to the contact list and address book, with auto complete and everything.
This is really useful for a number of reasons, especially if you are away from your iOS devices or Mac, but you still want to check your iCloud e-mail, but its also very useful because its the only way to check iCloud e-mail from a Personal Computer, whether that Personal Computer is running Windows or Linux, or anything else. Do bear in mind if you've two factor authentication setup for Apple ID you will need to check every iCloud login from a brand new browser as a security measure.
As you are likely discovering, the iCloud.com web site is remarkably full featured, with complete access to e-mail, contacts, notes, reminders, calendar, iCloud Photos, documents saved in iCloud, and even Pages, Keynote, and Numbers applications that run within an internet browser. The internet based services are just undeniably useful, give them a look.