Given the partnership between Microsoft and Yahoo! regarding instant messaging and presence interoperability, I wonder if we will see a an e-mail connector between Yahoo! and Outlook. Probably not - but it would be a valuable gesture.
Microsoft announced in early May that it would make available within a few weeks a beta of a connector for Outlook 2003/2007 users who want to manage their Windows Live Hotmail accounts from inside Outlook.
The beta of that connector, as of this week, is now available for download from the Microsoft Downloads site.
(The same beta connector also can be used by Outlook users to manage their Office Live Mail accounts.)