DirSync vs Entra Cross-Tenant Synchronisation

Microsoft Entra cross-tenant synchronisation is built for collaboration between tenants. It pushes internal users from one tenant into another as B2B users, in one direction, about every 40 minutes. Those users still sign in to their home tenant, so they are not first class citizens, and Microsoft states that it is not a migration tool.

It has limits for migration work. It does not sync devices or contacts, does not create Microsoft 365 or mail-enabled groups, cannot match existing internal users in the target, and does not connect to on-premises Active Directory.

PowerSyncPro DirSync is built for coexistence and migration. It syncs users, groups, contacts and guests between AD, Microsoft Entra ID (formerly Azure AD) and Google Workspace, matches existing accounts, syncs passwords and SID history between AD forests, and builds the user mapping PowerSyncPro Migration Agent needs to move devices.

You can use both: cross-tenant sync for early collaboration, and DirSync for the migration itself.