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Update Microsoft Entra Connect to include more than one forest

Important

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Skype for Business Online, excluding the service operated by 21Vianet in China, was retired on July 31, 2021.

Microsoft Entra Connect supports syncing from multiple forests. It supports only one instance of Microsoft Entra Connect syncing to Microsoft Entra ID. In cases where Microsoft Entra ID is already installed in one forest, the existing instance of Microsoft Entra Connect must be updated to sync from the other forest.

  • If all identities are represented only once across both forests (that is, you haven’t made any mail-enabled contacts), then you can rerun the Microsoft Entra Connect wizard, choose “Customize synchronization options,” and then on the Connect Your Directories page, enter the name of the other forest and credentials.

    The Connect your directories page.
  • If users can exist in more than one directory, and you’ll be merging the data, you'll need to uninstall Microsoft Entra Connect and reinstall it. You need to take this action because the cross-forest join rules condition can only be configured during the first install. This is done on the following page:

    The Uniquely identifying your users page.

See also

Cloud Consolidation for Teams and Skype for Business