One of the things we have improved in Outlook 2010 is IMAP accounts. IMAP is a protocol that is used by many e-mail services, including Gmail and AOL. If your e-mail service supports IMAP, you can use Outlook to access your e-mail.
Link – http://blogs.msdn.com/outlook/archive/2010/02/06/better-imap-in-outlook-2010.aspx
