Question : Entourage can not synchronize inventory to Exchange Server

A few of my users get the error message on their MACs several times a day. It doesn't keep them from sending or receiving mail but it has become inconvenient.

We already tried updating Entourage but we still get the messages.

One user reports that he's not accessing any shared calendars.

Answer : Entourage can not synchronize inventory to Exchange Server

Ok, can please take a look to this article.
The problem is with the exchange server 2003, Entourage cannot synchronize calendar items on a shared calendar in Exchange Server 2003.

This article talks about entourage 2004, but the reported problem is with the Exchange server so it can also happen in the entourage 2008
http://support.microsoft.com/kb/922104