Outlook Calendar and OWA Issue

[CycleSoft]

I have an addin that uses the Outlook object model for the creation of
appointments. Everything works fine with Outlook and when the appointments
are viewed all works as required. However, when the same calendar is viewed
through OWA, each appointments has the same start and end date.

I note from the Microsoft site that this issue existed with Exchange 2000
but I am using Exchange 2003, ver 1.1! Appreciate any suggestions?

Versions:
Outlook Client 2003
OWA for Exchange Server 2003
Exchange Server 2003 ver 1.1

Regards
Michael