Gmail
Google's Gmail application has some powerful features that probably weren't available in your old mail program, while a few things might work differently.
Get Organized: Use labels and filters to help you organize your email and manager the flow of your incoming messages. You can automatically label, archive, delete, star, or forward your mail - all based on a combination of keywords, sender, recipients, and more.
Consolidate your email: Get mail from other email accounts in your Gmail inbox and send messages from different addresses. By adjusting your Settings, you can either forward mail from other accounts, or set up Gmail to fetch your mail.
Go Invisible: Avoid unwanted chats by setting your status to "Invisible" so you appear offline, but can still send and receive messages.
Reply by Chat: Instead of emailing back and forth, try replying by chat. Gmail automatically saves your conversations, so you can always revisit them just like email messages.