最近在一个项目中，发现子域多了以后，最后建立的几个子域在运行Setup /PrepareDomain时，总会遇到以下故障：

检查Exchange Setup Log，发现Adding ACE已经完成，在

Used domain controller DC-01.xx.xx to read object CN=Exchange Servers,OU=Microsoft Exchange Security Groups,DC=xx,DC=xx后，随即

[2009-10-29 10:53:26] [2] [ERROR] Active Directory operation failed on DC-01.xx.xx. This error is not retriable. 其他信息: 指定的用户不存在。。
Active Directory 响应: 00000525: NameErr: DSID-031A0F80, problem 2001 (NO_OBJECT), data 0, best match of:
    ''

[2009-10-29 10:53:26] [2] [ERROR] 对象不存在。
[2009-10-29 10:53:26] [2] Ending processing.
[2009-10-29 10:53:26] [1] The following 1 error(s) occurred during task execution:
[2009-10-29 10:53:26] [1] 0.  ErrorRecord: DC-01.xx.xx 上的 Active Directory 操作失败。此错误不可重试。其他信息: 指定的用户不存在。。
Active Directory 响应: 00000525: NameErr: DSID-031A0F80, problem 2001 (NO_OBJECT), data 0, best match of:
    ''

[2009-10-29 10:53:26] [1] 0.  ErrorRecord: Microsoft.Exchange.Data.Directory.ADOperationException: DC-01.xx.xx 上的 Active Directory 操作失败。此错误不可重试。其他信息: 指定的用户不存在。。
Active Directory 响应: 00000525: NameErr: DSID-031A0F80, problem 2001 (NO_OBJECT), data 0, best match of:
    ''
---> System.DirectoryServices.Protocols.DirectoryOperationException: 对象不存在。
   在 System.DirectoryServices.Protocols.LdapConnection.ConstructResponse(Int32 messageId, LdapOperation operation, ResultAll resultType, TimeSpan requestTimeOut, Boolean exceptionOnTimeOut)
   在 System.DirectoryServices.Protocols.LdapConnection.SendRequest(DirectoryRequest request, TimeSpan requestTimeout)
   在 Microsoft.Exchange.Data.Directory.PooledLdapConnection.SendRequest(DirectoryRequest request, LdapOperation ldapOperation)
   在 Microsoft.Exchange.Data.Directory.ADSession.ExecuteModificationRequest(ADRawEntry entry, DirectoryRequest request, ADObjectId originalId)
   --- 内部异常堆栈跟踪的结尾 ---
   在 Microsoft.Exchange.Data.Directory.ADSession.AnalyzeDirectoryError(PooledLdapConnection connection, DirectoryRequest request, DirectoryException de, Int32 totalRetries, Int32 retriesOnServer)
   在 Microsoft.Exchange.Data.Directory.ADSession.ExecuteModificationRequest(ADRawEntry entry, DirectoryRequest request, ADObjectId originalId)
   在 Microsoft.Exchange.Data.Directory.ADSession.Save(ADObject instanceToSave, IEnumerable`1 properties)
   在 Microsoft.Exchange.Management.Tasks.SetupTaskBase.Save(ADRecipient o, ADRecipientSession recipientSession)
   在 Microsoft.Exchange.Management.Tasks.InitializeDomainPermissions.InternalProcessRecord()
   在 Microsoft.Exchange.Configuration.Tasks.Task.ProcessRecord()
[2009-10-29 10:53:26] [1] [ERROR] Active Directory operation failed on DC-01.xx.xx. This error is not retriable. 其他信息: 指定的用户不存在。。
Active Directory 响应: 00000525: NameErr: DSID-031A0F80, problem 2001 (NO_OBJECT), data 0, best match of:
    ''

[2009-10-29 10:53:26] [1] [ERROR] 对象不存在。
[2009-10-29 10:53:26] [1] Setup is halting task execution because of one or more errors in a critical task.
[2009-10-29 10:53:26] [1] Finished executing component tasks.
[2009-10-29 10:53:26] [1] Ending processing.
[2009-10-29 10:53:26] [0] The Exchange Server Setup operation did not complete. For more information, visit http://support.microsoft.com and enter the Error ID.
[2009-10-29 10:53:26] [0] End of Setup

************************************************************************************************************************************************************************

Solution：

1、在根域GC上，做一次强制复制；

2、在根域DC上，将子域Exchange Install Domain Servers组添加到Exchange Servers组；

3、重新执行setup /preparedomain。

感谢Fiona Liao MM的帮助~~~。