Overview

SID History migration is a useful feature for enabling coexistence during an Active Directory domain migration. For instance, if Contoso acquires Fabrikam and migrates Fabrikam users into the Contoso Active Directory domain, SID History allows those migrated users to retain access to resources (such as file shares, printers, and applications) that remain in the source Fabrikam domain. It works by appending the user's source account SID to their new account in the target domain, preserving access until the resources can be fully migrated. Note that SID History is intended as a temporary solution.

Prerequisites

To migrate SID History, several prerequisites must be configured in both the source and target domains. These steps are detailed in the Directory Synchronization Prerequisites Guide, starting on page 15.

Prerequisites Checker

After configuring the prerequisites, use the following script to verify that all requirements for SID History migration are met. Run the script from each of these locations (selected via menu options within the script):

• The source PDC Emulator
• The target PDC Emulator
• The PowerSyncPro server (with line-of-sight access) or the target Remote Agent

The script can be downloaded here: Check-sidHistory-preReqs.ps1

Notes:

• Run the script as Administrator.
• The script is for reporting purposes only; it reads configurations without making changes.