Android: Microsoft rolled out a preview version of its native Android client back in January. Three months later, it's out of preview and has a more Android-friendly feel and some added features.
Changes since the preview version include the ability to customise swipe gestures, a simplified People view for contacts, and a new three-day calendar view. You can also switch the default folders where emails are archived or scheduled, and permanently empty your deleted items folder.
The app requires Android 4.0 or above.