Windows Live Mail 2008 Beta (Build 0908) - Free Email and Free Calendar, Too

Windows Live Mail, Microsoft's free and more connected replacement for Windows Mail and Outlook Express, is available in a new beta version that adds a calendar syncing with Windows Live Calendar. An Add to calendar button lets you turn emails into events easily (though it does not extract dates).
›› Windows Live Mail is a comfortable email program that lets you access IMAP, POP and Windows Live Hotmail accounts with verve and ambition to connect with Windows Live Messenger, Windows Live Calendar, your blog and RSS news feeds, too. (Windows)