Exchange 2003 sp2 and W8.1 Calendar app

Under W8.1,we encounter a problem between the application"Calendar" and our mail server in Exchange 2003sp2.
No worries to read his email and synchronize appointments between the Exchange server and apps EXCEPT if we create or modify an appointment from the calendar app in W8.1.

We then encounter the message"Problem syncing your changes..."with the options "open event" or "Eject".
Apparently we are not alone in experiencing this problem.

Is this an incompatibility with our Exchange server? Is there a fix ?

In advance thank you for your review.