Article ID: 260781 - View products that this article applies to.
This article was previously published under Q260781
You cannot change the operational mode from mixed mode to native mode in Microsoft Exchange Server 2003 or in Microsoft Exchange 2000 Server. When you view the properties of your organization in Exchange System Manager, the Change Mode button is unavailable. (The button appears dimmed.)
This problem may occur when the following conditions are true:
To resolve this issue, follow the methods below in the order that they appear in. If Method 1 does not resolve the issue, follow the steps in Method 2. If Method 2 does not resolve the issue, follow the steps in Method 3, and so on.
Method 1: Manually delete the Site Replication Service from Exchange System Manager
You may be able to resolve this issue if you delete the Site Replication Service (SRS). For additional information about how to manually delete the Site Replication Service from Exchange System Manager, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/329606/ )Cannot use Exchange System Manager to delete SRS from remote computer
Method 2: Use the LDP tool (Ldp.exe) to edit attributes
If you cannot remove the SRS, use the LDP tool to remove the following attributes:
To edit these attributes, follow these steps.
Warning If you use the ADSI Edit snap-in, the LDP utility, or any other LDAP version 3 client, and you incorrectly modify the attributes of Active Directory objects, you can cause serious problems. These problems may require you to reinstall Microsoft Windows 2000 Server, Microsoft Windows Server 2003, Microsoft Exchange 2000 Server, Microsoft Exchange Server 2003, or both Windows and Exchange. Microsoft cannot guarantee that problems that occur if you incorrectly modify Active Directory object attributes can be solved. Modify these attributes at your own risk.
Method 3: Remove the SRS from Active Directory
To remove the SRS from Active Directory, follow these steps:
Method 4: Edit the msExchMixedMode attributeTo change the value of the msExchMixedMode attribute to False, follow these steps:
For additional information about how to prepare a mixed mode organization for conversion to native mode, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/272314/ )Preparing a Mixed Mode organization for conversion to Native Mode
The ADSI Edit tool is included with the Microsoft Windows 2000 Support Tools. For additional information about how to install the Windows 2000 Support Tools, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/301423/ )How to install the Windows 2000 Support Tools to a Windows 2000 Server-based computer