XADM: How to Change the POP3-Download Order

Currently, there is no mechanism in Exchange Server 5.5 to control the download order of POP3 messages. In Exchange Server 5.0, the download order for messages was from old to new. In Exchange Server 5.5, the download order for messages is reversed and changed from new to old.

This feature is available in the latest service pack for Exchange Server version 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base: The English version of this feature should have the following file attributes or later:

Component: Information Store


This feature was first included in Exchange Server 5.5 Service Pack 3.

In addition to the new files noted above, the following registry changes must be made to enable this functionality. To make the registry changes, perform the following steps:

WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

1. Stop the Microsoft Exchange Information Store service.
2. Apply the fixed files noted above.
3. Start Registry Editor (Regedt32.exe).
4. Go to the following location in the registry:
   HKEY_LOCAL_MACHINE\CurrentControlSet\Services\MSExchangeIS\ParametersSystem
5. On the Edit menu, click Add Value.
   Value Name: POP3 Compatibilty
   Data Type: REG_DWORD
   Value: 0x0, 0x40
   Default: 0x0 (not in registry by default)
   
   Description: This parameter control the download order for the POP3 messages, Set this value to 0x40 and you will get the message download order of new to old. Set this value to 0x0 and you will get the message download order of old to new.
6. Click OK, and quit Registry Editor.
7. Restart the Microsoft Exchange Information Store service.