Better performance and reliability as a result of a new threading model and database improvements.
A new modern user interface with improved scrolling and agility when switching between Ribbon tabs.
Online archive support for searching Exchange (online or on-premises) archived mail.
Master Category List support and enhancements delivering access to category lists (name and color) and sync between Mac, Windows and OWA clients.
Office 365 push email support for real-time email delivery.
Faster first-run and email download experience with improved Exchange Web Services syncing.