Microsoft has built native Outlook Web App clients for Apple’s iPhone and iPad, both of which can be installed directly from the Apple App Store as of July 16.
The catch: Users need an Office 365 subscription that includes Exchange Online to make use of the new, free apps.
Outlook Web App (OWA) is a client with that provides email, calendar, and contact functionality. It works the same way that Outlook Web App in the browser does. However, according to a new Office 365 Technology blog post from Microsoft, the native versions provide “additional capabilities that are only possible through native integration of the app with mobile devices.”