Gmail is become popular email service with millions of user. It has lots of great features which have 
changed email working style. Its fast mail viewing feature makes it popular and many of other email service site have copied this feature. One of the features is that you can download all your emails from Gmail to your mail client like Outlook, Thunderbird etc. Not just download you can send email from your mail client with your Gmail id.
To download Gmail messages you have to do some changes in your Gmail account. This can be done by going to your Gmail setting.
In settings there is Forwarding and POP/IMAP tab on IMAP Access Enable IMAP.
Now you have to setup your mail client. There are many mail client supported by Gmail.
Supported mail clients are:
Outlook Express (Windows)
Outlook 2003 (Windows)
Outlook 2007 (Windows)
Apple Mail 2
Apple Mail 3 (Leopard)
Windows Mail
Thunderbird 2
Some Other Mail Clients
Mobile Devices
Android
iPhone
BlackBerry
Symbian
Windows Mobile 5
Windows Mobile 6
SnapperMail
To setup you mail client find instruction here.
After configuring your mail client you will be able to send and receive Gmail messages with your mail client and you don’t need to go to Gmail.com.
