You may receive an error message when you try to expand the public folder hierarchy in Exchange System Manager on a server that is running Exchange Server 2003

When you try to expand the public folder hierarchy in Exchange System Manager on a server that is running Microsoft Exchange Server 2003, you may receive the following error message:Additionally, the following events are logged in the Application log:

Event Type: Error
Event Source: MSExchangeDSAccess
Event Category: General
Event ID: 2050
Description: Process Process Name (PID=Process ID). The shared memory heap could not be created.

Event Type: Information
Event Source: DAVEX
Event Category: None
Event ID: 101
Description: DAVEX to be shutdown. Version: Exchange Build Number

This issue occurs if the ExchangeApplicationPool application pool is deleted from the application pools in Internet Information Services (IIS).

To resolve this problem, re-create the ExchangeApplicationPool application pool. Then, assign the appropriate virtual directories to use the ExchangeApplicationPool application pool. To do this, follow these steps:

1. Click Start, click Run, type inetmgr, and then click OK.
2. Expand SERVERNAME (local computer).
3. Right-click Application Pools, point to New, and then click Application Pool.
4. In the Application pool ID box, type ExchangeApplicationPool.
5. In the Application pool settings box, click Use default settings for new application pool, and then click OK.
6. Right-click ExchangeApplicationPool, and then click Properties.
7. Click the Identity tab, and then under Select a security account for this application pool, click Predefined.
8. In the Predefined list, click Local System, click OK, and then click Yes.
9. Expand Web Sites, expand Default Web Site, right-click Exadmin, and then click Properties.
10. Click the Virtual Directory tab.
    1. If Application name and Application pool are available (do not appear dimmed), click ExchangeApplicationPool under Application pool, and then click OK.
    2. If Application name and Application pool are unavailable (appear dimmed), click Create, and then type default application in the Application name box.
11. In the Application pool list, click ExchangeApplicationPool, and then click OK.
12. Repeat steps 9 and 10 for the following virtual directories:
    • Exchange
    • ExchWeb
    • ExchWeb\bin
    • Microsoft-Server-ActiveSync
    • Public
13. Close the Internet Information Services Manager console.