Saturday, September 25, 2010

Part 1 of 3 (LAB) - Forest Active Directory & Exchange Migration

Active Directory Migration ADMT (Retaining User SID)

The goal of this blog is the detail the lab I created to help me setup and test the Microsoft ADMT (Active Directory Migration Tool) and then alignn this with the Microsoft Exchange Migration wizard.  As shown in the below digram we have 2 separate domains Rhode.local and Silverwater.local, the aim is to migrate all user accounts followed by thier mailboxes.

AD Forests
Both domain have a single Domain Controller and Exchange Servers. Secondary DNS zones have been configured for each domain and a 2-way Forest Trust is in place.

The migration is seperated into 3 stages. 

1. How to migrate users using ADMT and retain user SID's?

2. How to migrate mailboxes and align them to the migrated accounts?

3. How to change user clients outlook profile to the migrated mailboxes?

This blog will focus on migrating all user accounts using the Microsoft Active Directory Migration tool (ADMT). ADMT provides an effective tool that simplifies the process of migrating users, computers, and groups to new domain.

We will retain users SID's during the migration, this is important for phase 2 mailboxes migration. This will ensure once we come to the mailbox migration we can associate the mailboxes with the migrated user IDs.

Security Identifier (commonly abbreviated SID) is a unique name ) which is assigned by a Windows Domain controller during the log on process that is used to identify a subject, such as a user or a group of users in a network of NT/2000 systems.

The following steps must  be configured before installing ADMT:
a)     DNS must be configured on both Domain controllers. This step is critical in getting the trust to work. On both opposing  domains a new secondary DNS zone will be added for each domain name.
b)     Once the secondary zones have been added, the “Zone Transfer” setting must be changed to allow replication of zones to each domain. Simple allow unrestricted zone transfers as both domains are considered trusted.
c)      Create 2-WAY Transitive trust been both domains.  
Once the infrastructure is complete, the following steps are used to migrate user accounts across the forest.

 1. Run ADMT from Rhodes AD1

 2.  Select the users to migrate

 3.  Retain SID History

At this point all users from the Silverwater Domain  have been imported in the Rhodes domain whilst retaining their SID history.

The next step is to migrate the mailboxes....


Active Directory Migration Tool (ADMT) v3.0 Migration Guide

1 comment:

  1. Hi Andrew,
    Thanks for your help.It has been very good experience reading your blog.Exchange Migration