I opened a project in Microsoft Office Project 2007 that I created in Microsoft Office Project 2003. When I recalculated the project, the durations changed, even though I didn't make any changes that would affect duration.
Office Project 2003 did not update elapsed durations when a project was recalculated. This has been fixed in Office Project 2007. When you recalculate an Office Project 2003 file in Office Project 2007, the elapsed durations are updated, resulting in changed data. The new data reflects the accurate elapsed durations for your project's tasks.