Google has launched a Google Chrome App for using Gmail Offline. It is intended for situations when you need to read, respond to, organize and archive email without an internet connection. This HTML5-powered app is based on the Gmail web app for tablets, which was built to function with or without web access. After you install the Gmail Offline app from the Chrome Web Store, you can continue using Gmail when you lose your connection by clicking the Gmail Offline icon on Chrome’s “new tab” page. 
mpose E-mail even when you are offline, your message will remain in the outbox and the message is sent automatically once you get online. Although you cannot enhance your text like Bold, Italic etc., there is still a way to enhance your text using some word processors like MS Word and simply Copy Paste them.
