On-premises Active Directory to Azure Active Directory Transition

As businesses accelerate digital transformation, legacy on-premises identity systems increasingly hinder agility, scalability, and security. Azure Active Directory (Azure AD)—Microsoft’s cloud-native Identity-as-a-Service (IDaaS) platform—offers a future-ready alternative that unifies identity management across cloud and hybrid environments. By transitioning from traditional Active Directory to Azure AD, organizations gain intelligent access control, conditional access policies, and integration with Microsoft Security Intelligent Graph, which uses machine learning to detect and prevent credential compromise in real time. Our On-premises Active Directory to Azure Active Directory Transition service is designed to execute this strategic shift with precision, minimizing disruption while maximizing security, compliance, and operational efficiency.

Scope of the Service

This service encompasses the full lifecycle of identity modernization, including assessment, planning, configuration, user and device transition, and decommissioning of legacy infrastructure. Key deliverables include:

• Comprehensive analysis of existing on-premises AD topology, GPOs, and dependencies
• Licensing assessment and recommendations for Microsoft 365 and Azure AD
• Design and implementation of Azure AD identity architecture (cloud-only or hybrid)
• Migration from Group Policy Objects (GPOs) to Microsoft Intune for endpoint management
• Configuration of user profiles, device enrollment, and conditional access policies
• Phased user cutover with pilot group validation
• Secure decommissioning of on-premises domain controllers
• Final project documentation and closeout report

Note: File migration to OneDrive or SharePoint Online, third-party application reconfiguration, non-Windows device support, and end-user training are excluded from the base scope and available as optional add-ons.

Migration Process

1. Kick-off and Discovery

We begin with a project initiation meeting to align on objectives, timelines, and stakeholder roles. A detailed discovery phase follows, analyzing your current AD forest, organizational units (OUs), GPOs, application dependencies, and user/device inventory.

2. Design and Planning

Based on findings, we design a target-state Azure AD architecture, including:

• Identity model (cloud-only vs. hybrid with Azure AD Connect)
• Group and role strategy aligned with least-privilege principles
• Intune policies to replace legacy GPO functionality
• Conditional access and multi-factor authentication (MFA) requirements

3. Environment Preparation

We configure the Azure AD tenant, assign licenses, set up Intune, and establish synchronization (if hybrid). Application compatibility is validated, and prerequisites—such as Windows 10 Pro and cloud file readiness—are confirmed.

4. Pilot Migration

A small group of users is migrated to validate:

• Authentication and single sign-on (SSO) functionality
• Device enrollment and policy enforcement via Intune
• Access to critical applications and resources
• User experience during login and daily operations

5. Full Cutover

Upon pilot success, all remaining users and devices are transitioned. Local domain controller dependencies are severed, and devices are reconfigured for Azure AD join or hybrid join. Users may need to restart and re-authenticate.

6. Decommissioning & Validation

After confirming stability, on-premises domain controllers are demoted and retired. Final validation ensures all success criteria are met, including license compliance and system functionality.

Roles and Responsibilities

IT Partner Responsibilities

• Assess current AD environment and dependencies
• Evaluate and recommend appropriate licensing
• Design and implement Azure AD and Intune configuration
• Migrate GPO logic to Intune policies
• Execute pilot and full user/device transition
• Assist with device reconfiguration and Azure AD join
• Demote and decommission on-premises domain controllers
• Document all phases and deliver a final project report

Client Responsibilities

• Appoint a dedicated project liaison
• Provide Global Admin access to Azure and Microsoft 365 tenants
• Ensure all devices run Windows 10 Pro or newer
• Migrate user files to OneDrive/SharePoint prior to cutover
• Procure and assign required Microsoft 365/Azure AD licenses
• Grant physical and remote access to servers and workstations
• Configure network and DNS settings as needed
• Approve infrastructure changes and device reconfigurations
• Coordinate internal resources and external dependencies
• Resolve basic user-level issues using provided guidance

Expected Results

• Fully operational cloud-based identity system in Azure AD
• Elimination of on-premises AD infrastructure and associated costs
• Enhanced security through MFA, conditional access, and threat detection
• Streamlined device and policy management via Microsoft Intune
• Seamless user experience with SSO to cloud and legacy applications
• Reduced helpdesk burden and operational overhead

Limitations and Important Notes

• Non-Windows devices (macOS, Linux, iOS, Android beyond basic enrollment) are not supported in the base scope
• Legacy Windows versions (e.g., Windows 7, 8.1) require upgrade prior to migration
• Third-party applications relying on Kerberos or NTLM may need re-architecture
• Hardware or OS-level issues on client devices are outside project scope
• End-user training and file migration are billable add-ons

Prerequisites

• Active Azure and Microsoft 365 subscriptions
• Windows 10 Pro (or newer) on all corporate devices
• All user files migrated to OneDrive or SharePoint Online
• Applications verified for cloud identity compatibility
• Legacy email systems (if any) prepared for transition to Exchange Online

Success Criteria

• Successful pilot migration with zero critical issues
• All users able to log in and access resources via Azure AD
• Full license compliance across the organization
• Intune policies effectively replacing former GPOs
• On-premises domain controllers fully decommissioned
• Stable, secure, and supportable cloud identity environment

Project Deliverables

Upon completion, we provide a comprehensive closeout report detailing:

• Final project status and validation results
• Time and effort allocation per phase
• List of resolved issues and outstanding items (if any)
• Final cost reconciliation

Additional documentation (e.g., runbooks, policy templates) is available upon request for an extra fee.

Why Choose IT Partner?

We bring deep expertise in Microsoft identity platforms and a proven methodology for cloud transitions. Our approach balances technical rigor with user experience, ensuring your move to Azure AD strengthens security, simplifies management, and positions your organization for long-term cloud success—without surprises, downtime, or hidden costs.