Best directory sync software for multi-domain forests

PowerSyncPro is built for complex multi-domain and multi-forest Active Directory estates. PowerSyncPro DirSync keeps users, groups, contacts, passwords and SID history in sync between domains and forests for as long as you need coexistence. PowerSyncPro Migration Agent then moves each Windows device to the new domain or tenant without reimaging.

The right software for a complex forest has to do five things. This is how PowerSyncPro handles each one:

• Sync between many domains and forests. DirSync synchronises Active Directory to Active Directory, Active Directory to Microsoft Entra ID (formerly Azure AD), and Entra ID to Entra ID. It also reads from Google Workspace as a source. It migrates OU structures between Active Directory domains.
• Keep access working during coexistence. DirSync synchronises passwords in both directions and writes each source SID to SID history, so migrated users keep access to file shares, printers and applications in the source domain. A prerequisite checker confirms each domain is ready for SID history before you start.
• Work across disconnected networks. The Remote Sync Agent runs next to each domain and sends directory data to the PowerSyncPro server over the internet. The server needs no direct line of sight to your domain controllers, and the credentials for each domain stay on the local agent.
• Reshape data on the way through. Sync profiles scope which objects move. Attribute mappings and expressions transform values between source and target. Full and delta runs keep changes flowing after the first sync.
• Move the devices as well as the identities. PowerSyncPro Migration Agent migrates each Windows device in place. It handles the domain join, Intune enrolment, BitLocker and user profiles, and retries on its own schedule if a step fails.

Other tools cover parts of the same ground:

• Microsoft Active Directory Migration Tool (ADMT) is free and copies objects between domains as a one-off migration. It does not keep directories in sync afterwards. Limited to no support
• Microsoft Entra Connect (formerly Azure AD Connect) and Entra Cloud Sync synchronise one or more forests into a single Entra ID tenant. They do not synchronise one Active Directory forest to another.

Choose PowerSyncPro when you need directory sync, password and SID history coexistence, and device migration from one product, across forests that cannot see each other on the network.