Here's how you can install GNOME's Evolution mail and calendar application in Ubuntu 14.04.
1. Open a terminal window.
2. Type in the following commands then hit Enter after each.
sudo add-apt-repository ppa:fta/gnome3
sudo apt-get update
sudo apt-get install evolution
3. Use this command to remove Evolution.
sudo apt-get remove evolution
According to Linux G:
Evolution is the default mail client of Gnome, providing integrated mail, calendar funcitonality and address book. The latest version avilable is Evolution 3.13.2, which has been recently released.More at Linux G
Additional resources for Evolution
Additional Ubuntu resources