The new iOS 7 was released by Apple today, and as I have already described most of the operating systems for setting up Active Sync here (is there actually one more missing?), iOS 7 is now also being added.
So first switch to the iPhone settings
Select the "Mail, Contacts, Calendar" item there
Add a new account now
Choose Yahoo...uh wait, Exchange. (Even with the current logo 
Enter e-mail address and password
Confirm the usual message if you are too lazy to import the certificate on the iPhone, the message does not appear with a valid certificate from a public CA. Or you use an internal CA like I do here for Exchange 2013 and here for Exchange 2010 have described.
Now add the missing information: Server (use external host name), domain, and AD user name
And confirm the message again
Finally, select what you want to synchronize and press Save
If you are using an Active Sync policy, you will receive a message that the device must be authorized by an administrator; if you do not have a policy, you will see the mails after a short time.
