Let us see , how to remove Microsoft Exchange Active Sync account from IPhone 5
Choose Settings – Mail,Contacts,Calendars
Choose the account you want to remove
Choose Delete account
Good to know 
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I am setting up new company iPhones (5s’s to be exact) and I do not have the ability to “delete account” on the Exchange Active Sync email account. I also cannot edit the username (which is blank) for the ActiveSync credentials. What might my problem be?
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