Problem with recurring appointments between Microsoft Office Outlook 2003 and Microsoft Exchange Server 2010

Hi all!

Here is what software we use:
Server:
Microsoft Server 2008 R2 Standard - SP1 - Ver: 6.1.7601
Microsoft Exchange Server 2010 Ver: 14.1.218.15 - Update Rollup 2 SP1 KB2425179

Client:
Microsoft Windows XP - SP3
Microsoft Office Outlook 2003 (11.8330.8329) - SP3

Outlook Web Access (OWA):
Internet Information Services 7.5
Internet Explorer 8.0.6001.18702

Problem description:
Whenever we entere a recurring appointment into Microsoft Outlook 2003 Client that recurring appointment won't show up in the OWA (2010) Calendar.
However, when we enter an appointment into OWA (2010) Calendar the recurring appointment will show as well then in the Microsoft Outlook 2003 Client.
There seems also a problem with the Exchange Server 2010 about accepting recurring appointments from Microsoft Outlook 2003 Clients.
Is there a solution to that problem?


Current only workaround:
Go to our OWA website log in and enter in the OWA 2010 webinterface. Enter there the recurring appointment. Only through that way the recurring appointment will replicate right and can be seen in OWA and Outlook 2003 Client.


Please advice what I need to do so that the recurring appointments made in Outlook 2003 Client will replicate to the Server 2010 (OWA).