Gmail has introduced an offline Gmail feature that would allow you to access your Gmail even when there is no internet connection!
You can send, delete and read mails the way you would when online and the synchronization would happen as soon as there is an internet connection.
This would make desktop mail clients like outlook irrelevant for Gmail users. Offline Gmail is currently a Gmail Labs feature.
You need to have Google Gears installed in case you wish to make use of this offline feature of Gmail.
Here’s how you use the Gmail labs offline feature: