Os X Yosemite 10.10 -

: Added a "Today" view with customizable widgets for weather, calendar, and third-party apps.

: The Dock was redesigned as a 2D translucent strip, and system icons were flattened. OS X Yosemite 10.10

: Introduced Mail Drop for sending large attachments (up to 5GB) and Markup for annotating PDFs or drawing on images within the app. Top 10 Features of Yosemite (Mac OSX 10.10) : Added a "Today" view with customizable widgets