Have you watched Gmail Theater yet? This theater (video) is about the features and reasons why you should use Gmail. Here are the 4 reasons:
1. Gmail blocks spams before it even gets to your inbox
2. Gmail organizes and automatically groups emails into conversations
3. Gmail helps you easily find any email
4. Built-in chat means quick, real-time communication
If you want to use Gmail, you can join by sign-up for free. No more invitation needed.