For many, there is no need to use any of the supported email clients, whether free or not. Google's Gmail webmail system is extremely easy to use through the use of any modern web browser. The only requirement is that you have an active internet connection. Additionally, using the Google Apps launch pad (the 3x3 square in the top right corner of the web page), you can access any of the other Google Apps.
(Note: Using the Chrome browser does allow you to work with your email, calendar and Google files. Refer to the following links for more details:
Configuring your Google Apps account (for example, personal information, passwords, security) is accessed through the web interface. (Use the "My Account" option)
Customizing and configuring email-specific options is also accessed via this same interface. (Use the "Gearbox -> Settings" option)