Microsoft has released Office 2010 Home and Business Click to Run beta version to general public. According to Microsoft:

“This Beta product is delivered via Click-to-Run, a streaming technology for use on high-speed internet connections. If you are not on a high-speed connection, please download Office Professional 2010 Beta instead.”

See also:
Microsoft Office 2010 Public Beta

Microsoft introduces Click-to-Run feature which makes it possible for users to run Microsoft Office 2010 on any existing computer virtually so, when user will get connect to internet it automatically installs the software patches to run different versions of Office simultaneously.

Download Office 2010 Home and Business