The next version of Office moved a step closer to reality on Monday as Microsoft released an invitation-only technical preview of Office 2010.

However, the release of the software will be limited. Attendees of this week's Worldwide Partner Conference in New Orleans, as well as the recent TechEd show, will gain access to the desktop versions of Office 2010. Microsoft has also been taking sign-ups via its Office 2010: The Movie teaser Web site.

Also, it won't show off the program's biggest ch...