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Office 365 (iOS 7) - Sorting Messages
This document contains instructions on using a non-Microsoft email client, such as Apple Mail or Thunderbird. Microsoft does not recommend these clients for use with Office 365, and there are often significant limitations in client functionality as a result. Because of this, the DoIT Help Desk is only able to offer best effort support for these clients, and certain issues may require the use of a Microsoft client in order to be resolved. For more information on Office 365 client support, please see: Office 365 - Which clients/protocols will be supported?.Best Effort Support Only
This document clarifies that you can only sort messages chronologically in the iOS Mail application.
Unfortunately, you can't customize how email messages sort in the iOS 7 Mail application. They are always sorted from newest to oldest.