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CrossForestUserMigration.ps1.README.md

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CrossForestUserMigration.ps1

Purpose

Automates the migration of user accounts and associated resources between Active Directory forests. This script provides comprehensive user migration capabilities while maintaining security and ensuring business continuity.

Features

  • User account migration
  • Group membership transfer
  • Resource access migration
  • Profile migration
  • Security translation
  • SID history management
  • Exchange mailbox migration
  • Home directory transfer
  • Permission mapping

Requirements

  • Windows Server 2016 or later
  • PowerShell 5.1 or later
  • Active Directory PowerShell module
  • Exchange PowerShell module (optional)
  • Administrative privileges in both forests
  • Trust relationship between forests
  • Sufficient storage space
  • Network connectivity between forests

Usage

.\CrossForestUserMigration.ps1 [-SourceUser <user>] [-TargetForest <forest>] [-Options <options>]

Parameters:
  -SourceUser     Source user account
  -TargetForest   Destination forest
  -Options        Migration options (Profile/Exchange/Resources)

Migration Operations

  1. Pre-Migration Tasks

    • Source validation
    • Target validation
    • Permission check
    • Resource inventory
    • Trust verification
    • Space requirements
    • Backup verification

  2. Account Migration

    • User properties
    • Group memberships
    • Security identifiers
    • Password policies
    • Account settings
    • Profile settings
    • Login scripts

  3. Resource Migration

    • Home directories
    • Profile data
    • Network shares
    • Printer access
    • Application access
    • Certificate mapping
    • Custom attributes

  4. Exchange Migration

    • Mailbox export
    • Mail settings
    • Distribution groups
    • Mail flow rules
    • Calendar permissions
    • Contact lists
    • Auto-replies

Configuration

The script uses a JSON configuration file:

{
    "MigrationSettings": {
        "IncludeExchange": true,
        "IncludeHomeDir": true,
        "PreserveSIDHistory": true,
        "CleanupSource": false
    },
    "Validation": {
        "RequireSourceBackup": true,
        "ValidatePermissions": true,
        "TestMigration": true
    },
    "Reporting": {
        "DetailLevel": "Verbose",
        "NotifyUser": true,
        "GenerateReport": true,
        "LogLevel": "Info"
    }
}

Migration Features

  • Automated processing
  • Rollback capability
  • Progress tracking
  • Error handling
  • Validation checks
  • Resource mapping
  • Security preservation
  • Profile transfer

Error Handling

  • Connection failures
  • Permission issues
  • Resource conflicts
  • Space limitations
  • Trust problems
  • Migration failures
  • Rollback procedures

Log Files

The script maintains logs in:

  • Main log: C:\Windows\Logs\ForestMigration.log
  • Report file: C:\MigrationReports\<timestamp>_Migration.html
  • Error log: C:\Windows\Logs\MigrationErrors.log

Report Sections

Generated reports include:

  • Migration Summary
  • Account Details
  • Resource Status
  • Error Report
  • Validation Results
  • Performance Metrics
  • Recommendations

Best Practices

  • Pre-migration planning
  • Resource inventory
  • Backup verification
  • Test migrations
  • User communication
  • Staged approach
  • Validation checks
  • Documentation
  • Post-migration testing
  • Cleanup procedures
  • Performance monitoring
  • Security review

Integration Options

  • Exchange migration tools
  • User notification systems
  • Inventory systems
  • Monitoring tools
  • Reporting platforms
  • Backup systems
  • Management tools

Migration Checklist

  • Source environment readiness
  • Target environment preparation
  • Trust relationships
  • Network connectivity
  • Storage capacity
  • Security permissions
  • Backup verification
  • User notification
  • Resource availability
  • Application compatibility
  • Mail system readiness
  • Recovery procedures