Hybrid Config Could not load file or assembly 'Microsoft.SubstrateServices.Abstractions RRS feed

  • Question

  • We have an Exchange 2010 server and I am attempting to complete the Hybrid set up with Office 365.  I get this error:

    Could not load file or assembly 'Microsoft.SubstrateServices.Abstractions, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

    John Turcich NorSoft Consulting

    Friday, July 12, 2019 8:12 PM


  • Hi John,

    Hybrid deployments require the latest cumulative update or update rollup available for the version of Exchange you have installed in your on-premises organization. If you can't install the latest cumulative update or update rollup, the immediately previous release is also supported. Older cumulative updates or update rollups aren't supported.

    So please ensure that your environment has installed all the schema updates to support the hybrid setup, considering that the /PrepareSchema switch is valid only for schema operations. The /TenantOrganizationConfig switch is used with the /PrepareAD switch, we need to run Setup together with the /PrepareAD and /TenantOrganizationConfig switches. For example, run the following command:

    Setup.exe /PrepareAD /TenantOrganizationConfig MyTenantOrganizationConfig.xml /IAcceptExchangeServerLicenseTerms

    Note: To use the TenantOrganizationConfig switch you must first connect to your Exchange Online tenant via PowerShell and execute the following command: "Get-OrganizationConfig | Export-Clixml -Path MyTenantOrganizationConfig.XML".

    After that, re-run the hybrid setup again.

    Meanwhile, make sure that Exchange 2010 has met all the prerequisites: Hybrid deployment prerequisites.


    Manu Meng

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    Monday, July 15, 2019 2:45 AM