It's widely expected that a public beta build of Office 2010 will be available this week. Microsoft has kept quiet on the reports but has hinted on the official Office twitter account "MS Office team has some exiting news to tell at PDC. This is a must attend event. Stay tuned!" and a follow up post hints at possible social networking features in Outlook, "would you like your inbox to talk to your social networks? Useful integration or distraction?".