Windows Live Mail for Windows

You can access your e-mails, contacts, and calendar even if you're not online. Windows Live Mail allows you to manage multiple e mail accounts, including Hotmail, Gmail and Yahoo! Mail Plus, and many other features--all in one program

Offline access – Older messages and events can be accessed in Mail even if you're not online. Shared calendars – Your time isn’t always yours. Friends and family may need to see your schedule.