Here's a look at some of the new features....
Resize and format pictures
When you insert a picture in an email message, you’ll notice the new resize and rotation handles. You can use these to resize or rotate the image on the canvas. You can also pull up the context menu and select the Size and Position… option to manually set the size in the dialog, as shown below. Double-click an image in the editor to open up the full task pane with image editing controls.
Rich formatting support
With the new editor in Outlook 2016 for Mac, you now have access to a richer set of fonts, font colors and bullet and numbered lists—plus enhanced font editing and hyperlink dialogs. These are available on the ribbon by using the familiar controls in the Message tab or using the menus for Calendar, Contacts, Tasks, Notes and Signatures.
These new features will roll out in mid-May. Microsoft says it will continue to refine the editor in upcoming releases and will add support for tables.
More details at the link below...