Here is a guide to install Evolution mail and calendar on Ubuntu 13.04, you can install Evolution mail using the Ubuntu Software Center.
Evolution is a groupware suite which integrates mail, calendar, address book, to-do list and memo tools. Additional features include integration with Exchange servers, newsgroup client, LDAP support and web calendars. Evolution is a graphical application that is part of GNOME, and is distributed by Novell, Inc. Visit the Evolution Homepage
To install Evolution mail click on the link below
When the software center is opened click on the Install button and enter your password to authenticate the installation. When Evolution is installed you can close the software center, to start Evolution press the SuperKey and type: evolution
How to open the apt link? Read this article.