Entourage does not support synchronization

Hello,
From last day I am getting a strange problem with my Entourage.
The Reception box of my Entourage 2008 is not synchronizing with my 2003 Exchange Server.
I am getting the following error message and unable to receive any mail in my mail box Entourage.
I am expecting the resolution from experts.
Provide any assistance to fix this issue.
Thanks in advance.

Entourage does not support synchronization with all versions of Exchange Server.
If an Exchange account is imported with your identity, but mail and other items are not synchronized from the Exchange server, contact your Exchange Administrator.
