Migration from legacy SIEM systems to Microsoft Sentinel for modern security operations
Our Legacy SIEM to Microsoft Sentinel Migration service helps organisations transition from an existing security information and event management (SIEM) platform to Microsoft Sentinel. This service assesses current SIEM content, maps detections and workflows and orchestrates a phased cutover to a cloud-native security monitoring platform.
The engagement includes discovery of use cases, identification of essential detection rules, configuration of Sentinel data connectors and analytics, and validation of monitoring workflows so your security operations centre can operate with continuity and confidence.
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Service Overview
Highlights
- Assessment of existing SIEM use cases and analytics rules
- Migration planning and prioritisation
- Configuration of Microsoft Sentinel data connectors and analytics
- Phased cutover with validation and optimisation
Business Benefits
- Move to a cloud-native SIEM that scales with modern workloads
- Retain critical detections and workflows during migration
- Enable integrated analytics and threat detection in Sentinel
- Support a repeatable migration process with transparent tracking
Typical use cases
- Transition from legacy SIEM platforms such as Splunk and QRadar
- Organisations seeking to modernise security operations with Microsoft Sentinel
- Consolidation of multiple SIEM instances into a unified Microsoft Sentinel workspace
- Phased cloud security operations evolution across hybrid environments
Objectives & deliverables
What Success Looks Like
- Inventorise existing SIEM detections and use cases
- Define prioritised migration plan
- Map legacy rules into Microsoft Sentinel analytics templates
- Deploy and validate Sentinel connectors and workflows
What You Get
- SIEM content inventory and migration plan
- Mapped detection rules and analytics strategy
- Configured Microsoft Sentinel workspace with data sources
- Migration validation, reporting and operational handover
How It Works
- Discovery of current SIEM content and use cases
- Plan migration priorities and risk assessments
- Configure Microsoft Sentinel data connectors and analytics
- Pilot migrations, phased deployment and cutover
Engagement Options
- SIEM Content Inventory Workshop
- Sentinel Migration Planning Session
- Analytics & Detection Configuration Service
- Operational Validation and Reporting Support
Additional Information
Prerequisites & licensing
Before starting this migration, ensure you have administrative access to your current SIEM and to the Microsoft Sentinel workspace where the migration will occur.
- Access to legacy SIEM configuration, detection rules and use case documentation
- Microsoft Sentinel workspace provisioned with Contributor access
- Stakeholders from security operations and engineering teams
- Defined scope of use cases to migrate
Security & Compliance Notes
- Review and validate security roles and permissions before and after migration to maintain controlled access
- Ensure data connectors are configured to ingest logs securely from source systems
Common Bundles
Customers who use this service often bundle with these services
Sentinel Deployment & Integration
Deploy Microsoft Sentinel with structured data onboarding, workspace design, RBAC, and detection content so your SOC operates effectively and predictably.
SOC & Sentinel Enablement Workstream
SOC and Sentinel enablement workstream integrating security logs, detections, and response workflows to support effective threat monitoring and incident handling.
Microsoft 365 E5 Security Add-on Enablement
Enable Microsoft 365 E5 Security add-on controls with scoped implementation, validation, and clear operational ownership across identity, endpoint, and email security.
SOAR Automation & Playbook Design
Design Microsoft Sentinel SOAR automation and playbooks that automate triage, enrichment and response, reducing analyst effort while improving incident consistency.
Frequently Asked Questions
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