This article may offer a solution:-

http://www.microsoft.com/windowsmobi...ivesync45.mspx

Good luck.
"Gerald Thauberger" wrote in message
...
Hi Folks -
I recently upgraded my Office 2000 Premium to Office 2007 Enterprise.
All seemed to go well in the upgrade. The new Outlook calls up my contact
and calendar from the previous version just fine. The problem is that the
PDA, using Activesync 4.5.0 will not talk to the new Outlook that came with
Office 2007.

Any ideas as to how to get these two connected and talking again?

Thanks

Jerry