'%3e%3cpath%20d='M8%200C12.4183%200%2016%203.58172%2016%208C16%2012.4183%2012.4183%2016%208%2016C3.58172%2016%200%2012.4183%200%208C0%203.58172%203.58172%200%208%200ZM11.6162%204.38379C11.2257%203.99337%2010.5927%203.99338%2010.2021%204.38379L8%206.58594L5.79785%204.38379C5.40732%203.99334%204.77429%203.99329%204.38379%204.38379C3.99331%204.77429%203.99335%205.40733%204.38379%205.79785L6.58594%208L4.38379%2010.2021C3.99348%2010.5927%203.99341%2011.2257%204.38379%2011.6162C4.77426%2012.0066%205.40734%2012.0065%205.79785%2011.6162L8%209.41406L10.2021%2011.6162C10.5927%2012.0066%2011.2257%2012.0067%2011.6162%2011.6162C12.0067%2011.2257%2012.0066%2010.5927%2011.6162%2010.2021L9.41406%208L11.6162%205.79785C12.0066%205.40735%2012.0066%204.77429%2011.6162%204.38379Z'%20fill='%23080E17'%20fill-opacity='0.46'/%3e%3c/g%3e%3cdefs%3e%3cclipPath%20id='clip0_3761_713'%3e%3crect%20width='16'%20height='16'%20fill='white'/%3e%3c/clipPath%3e%3c/defs%3e%3c/svg%3e)
How to Migrate Part of an On-Premises Active Directory Environment
Question details
The user needs to migrate approximately half of a 3,000+ user on-premises Active Directory environment to a new server or virtual machine.
- Product
- Active Directory
- Device & OS
- not provided
- Scenario
- Planning a partial migration of an on-premises AD environment to a new setup while managing complex dependencies, identity synchronization, and prerequisites.
- Observed behavior
- The migration requires a custom design strategy tailored to the existing domain, forest, applications, DNS, and trusts.
Before initiating any changes to your Active Directory infrastructure, ensure you have a complete, verified system state backup of your current domain controllers and thoroughly document your existing forest, trust relationships, and DNS configurations.
Consult Microsoft Q&A Specialists for a Custom Migration Plan
Because a partial Active Directory migration is highly dependent on your specific architecture, engaging with Azure and AD specialists is the safest and most effective approach.
Migrating a subset of users involves complex dependencies like domain trusts, DNS records, SID history, and application integrations. There is no one-size-fits-all script or automated wizard for a split migration of this scale.
The Microsoft 365 Community typically has limited resources for deep infrastructure redesigns. Instead, it is highly recommended to reach out to dedicated Active Directory specialists to review your specific environment and synchronization needs.
Gather detailed information about your existing domain structure, forest functional level, application dependencies, and current DNS setups.
Clearly outline whether the target is a new on-premises virtual machine, a separate physical server, or an Azure AD environment.
Document the exact scope of the migration, outlining criteria for the 1,500 users moving and the 1,500 users staying, along with shared resource access needs.
Navigate to the Microsoft Q&A platform and post your detailed scenario under the 'Active Directory' or 'Azure Active Directory' tags to request guidance from enterprise specialists.
Equip Your Migrated Users with WPS Office
As you migrate users to a new Active Directory environment or VM infrastructure, providing them with reliable, low-overhead productivity tools is essential. WPS Office is a free, lightweight, and highly compatible alternative to Microsoft Office, ensuring a seamless transition for your newly migrated team.
- 1. Download the Installer: Visit the official WPS Office website to download the lightweight enterprise or free installer.
- 2. Deploy via Group Policy: Use your newly structured Active Directory environment to deploy the WPS Office MSI package to target machines via GPO.
- 3. Launch and Use: Users can log into their migrated workstations and immediately begin creating or editing legacy Office documents with zero compatibility issues.
Frequently Asked Questions
What tools are recommended for an on-premises Active Directory migration?
Microsoft traditionally recommends using the Active Directory Migration Tool (ADMT) alongside the Password Export Server (PES) for migrating users, groups, and computers between different domains or forests.
Can I migrate on-premises AD directly to Azure AD?
You can use tools like Azure AD Connect to synchronize on-premises identities to Azure AD. However, completely deprecating on-premises AD in favor of a cloud-only setup often involves a phased hybrid approach first.
Will migrating users affect their access to existing applications?
Yes. If applications rely on specific SIDs, permissions, or domain trusts, moving users to a new domain requires careful planning of SID history and trust relationships so they do not lose access to legacy resources.
How do I handle DNS during a split AD migration?
DNS must be configured to seamlessly resolve both the source and target domains. Conditional forwarders are typically set up between the two environments during the transition phase to ensure machines can locate domain controllers in both forests.
