I researched and found there is no EWS for Exchange Server 2003. I need to create events in Exchange Server Calendar through my website. So how can I create an event through my website?
On Exchange 2003 you have 3 client API options for creating appointments you can use either MAPI via the Outlook OOM or a third party library like Redemption http://www.dimastr.com/redemption , you could use CDOEX or exOledb but this only would work directly on the Exchange Server or WebDAV https://msdn.microsoft.com/en-us/library/ms877306%28v=exchg.65%29.aspx
Cheers Glen