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Better email management
More and more enterprise users are switching from in-house solutions to outsourced services, such as Google Apps or Microsoft's Office 365. While Apple already has Gmail and Microsoft Exchange (of which Office 365 is a cloud-based version), Apple has already catered for a wide audience.
That said, the iPhone and iPad maker has left a lot to be desired. Many of the features that these services offer are absent from iOS — even the ability to mark messages as different colors. Many third-party apps for the iPhone and iPad already offer this very basic functionality.