Microsoft is revamping Outlook 15. It will have Hotmail and social networking features built in. Outlook 15 will have native integration of Hotmail along with Facebook and LinkedIn social networking.
Another new Outlook 15 feature is called Peeks. It will offer more information about Outlook items without opening them. There are inline replies and a weather bar built in to the new Outlook. The Contacts module has been renamed to People. People connect natively to new calendar features.
Microsoft is also preparing a new platform called Office Web Apps Server. The server will be able to serve multiple SharePoint farms for editing documents. The final release for Outlook 15 is expected to be late 2012.