I'm not sure M$ would consider this a bug. Are you using Pocket Informant or Agenda Fusion? I think they have added features not supported by Outlook, including reminder times for tasks.
I am using PI on WM5 and my tasks reminder times work both ways. I am having trouble with the check complete coming from Outlook to the Ipaq. When I check complete on the desktop it does not always do the same on the Ipaq
__________________
Chris
ATT 8525
Windows Mobile 5
Pocket Informant