Ballmer Makes It Official: Windows 7 Beta Available

Microsoft Releases Office 2010, SharePoint 2010 Betas
Microsoft on Monday released betas of Office 2010 and SharePoint 2010 to its MSDN and TechNet subscribers.

Microsoft Discloses What's in Store for Windows 8...
The company revealed more details about its plans for a Windows 8 Metro app store. A test version of the store is expected in late February alongside the first Windows 8 beta.

Windows 8 Beta Could Arrive in January
Microsoft could release a beta of Windows 8 in "late January" or "late February," according to two media reports.