If you are using Entourage 2004 to connect to Exchange 2000 and notice that some mail folders show up in other Exchange clients (OWA or Outlook), but aren't showing up in Entourage, then your Exchange server may need this recently released Exchange 2000 hotfix. After applying the hotfix, you should follow these steps to get the folders back in Entourage (this text is copied from the end of section 5.2 of the Entourage 2004 readme):

If Exchange account mail folders are visible in Outlook but not in Entourage, make sure you have installed the latest update to Exchange. To access Exchange account folders within Entourage, use Outlook or Outlook Web Access (OWA) to rename the folder and then rename it again to its original name. The folder will then be visible within Entourage.

Here's some more info about the hotfix from the KB article:

SYMPTOMS

When you connect to your Microsoft Exchange 2000 Server account by using Microsoft Entourage 2003 for Mac, some Exchange folders are missing. These Exchange folders are visible when you use the Microsoft Windows version of Microsoft Outlook or when you use Microsoft Outlook Web Access to view the folders.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Microsoft Exchange 2000 Server service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;[LN];CNTACTMS

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
 
Note Because of file dependencies, this hotfix requires Microsoft Exchange 2000 Server Service Pack 3. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

301378 How to obtain the latest Exchange 2000 Server service pack