I just finished to install Microsoft Office 2010 B1 and I really like the new Outlook.
Word and Excel are very much the same as the 2007 version, just with a more Professional looking Ribbon Bar.
The small change I really like is the new “File Menu”
It now uses all the Application Window to show all the possible options:
The biggest effort in this release was to upgrade the interface of Outlook, Project and Visio, the 3 elements of the Suite that wasn’t lucky enough to be upgraded to the Ribbon interface in 2007
One of the real interesting thing is how they group messages together by subject/senders
And the list of persons involved in that conversation
I’ll soon install SharePoint Server 2010 to see if they improved the integration between the “offline” Office Suite and the Online version of SharePoint