Working away from your network or without an Internet connection doesn't mean that you can't use Outlook. If your organization uses Exchange, you have many options for accessing your e-mail messages and other information you manage within Outlook.
Cached Exchange Mode keeps a copy of your mailbox on your computer so you can keep working even when you are away from your network.
Cached Exchange Mode handles connecting and synchronizing your local mailbox for you. You can set it to cache all messages or just headers, to save bandwidth.
When you will be away from your computer for a while, Outlook can send an auto-reply message once to each person from whom you receive a message. This is a convenient way of letting people know when to expect a response from you.