XADM: Installing Exchange Server 5.5 in Windows 2000 Domain in Native Mode into Windows NT Server 4.0 Exchange Server 5.5 Site (259553)

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With Two One-Way Trusts Between Domains

1. Verify that your Windows 2000 domain is running in native mode in Active Directory Users and Computers; right-click the domain name, and then click Properties. When the domain is running in native mode, there is no way to change back to mixed mode, other than reinstalling the domain.
2. Create two one-way, non-transitive trusts between the Windows NT Server 4.0 domain and the Windows 2000 domain that is running in native mode by using Active Directory Domains and Trusts in Windows 2000 Server and User Manager for Domains in Windows NT Server 4.0. In Windows 2000, the trusts to the Windows NT Server 4.0 domain are added as external, non-transitive trusts. After you create the trusts in both domains, verify the trust from the Windows 2000 domain (click the trust, and then click Edit).
3. In the Windows 2000 domain, create an Exchange Server service account and add the Exchange Server service account to the organization, site, and configuration containers by using the Exchange Server Administrator program in the Windows NT Server 4.0 and Exchange Server site. Grant this account Service Account Administrator rights at all three levels. Also make sure that this account is added to the local Administrators group in the Windows 2000 domain.
4. Log on by using this Windows 2000 domain Exchange Server service account, and install Exchange Server to join the Exchange Server computer in the Windows NT Server 4.0 site. You need to apply Exchange Server 5.5 Service Pack 3 after installation is complete.

With a One-Way Trust Between Domains

1. In Windows NT Server 4.0 User Manager for Domains, add the Windows 2000 domain to the Trusting Domains box.
2. In Windows 2000 Active Directory Domains and Trusts, add the Windows NT Server 4.0 domain to the Domains trusted by this domain box.
3. Verify this one-way trust, and then log on to the Windows 2000 domain by using the Windows NT Server 4.0 domain Exchange Server service account. Install Exchange Server and join the Windows NT Server 4.0 and Exchange Server 5.5 site. To administer Exchange Server from the Windows 2000 domain, you need to log on to the Windows 2000 domain by using the Windows NT Server 4.0 domain Exchange Server service account.