Migrate from on‑prem or third‑party SIEMs to Microsoft Sentinel with a phased, low-risk approach - side-by-side deployment, content migration, and operational cutover.
Migrating to Microsoft Sentinel is not just a tool replacement - it is a transition of data sources, detection content, dashboards, SOAR workflows, and SOC processes. Microsoft provides guidance for planning a migration to Sentinel, including breaking the migration into phases and considering a side-by-side deployment to reduce risk during transition.
LW IT Solutions delivers SIEM migrations as a structured programme. We baseline your existing SIEM (use cases, data sources, rules, dashboards, and SOC workflows), map them to Sentinel-native equivalents, and implement a phased rollout that validates detections and operations before cutover. Where appropriate, we run Sentinel side-by-side with your legacy SIEM to de-risk the transition, validate coverage, and manage stakeholder confidence - then execute a controlled cutover with documentation, training, and a post-migration optimisation backlog.
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Service Overview
Highlights
- Current-state SIEM assessment: inventory data sources, rule content, dashboards, SOAR, and SOC processes
- Migration strategy and phases: plan a phased migration aligned to Microsoft guidance and your operational constraints
- Side-by-side deployment design: run Sentinel alongside the legacy SIEM to validate coverage before cutover (where appropriate)
- Data source onboarding: prioritise and onboard data connectors; align ingestion strategy to cost and use cases
- Detection content migration: migrate use cases into Sentinel analytics rules and tune for quality
- Dashboard migration: translate legacy dashboards into Sentinel workbooks aligned to stakeholder needs
- SOAR migration: re-implement response workflows using Sentinel automation rules and Logic Apps playbooks
- SOC process upgrade: triage, escalation, evidence handling, and continuous improvement cadence
Business Benefits
- Lower migration risk through phased rollout and side-by-side validation where appropriate
- Improved SOC effectiveness through modern detection content, automation, and structured workflows
- Clear coverage mapping so stakeholders understand what is protected and what is being improved
- Predictable cost and ingestion governance aligned to the use cases that matter most
Typical use cases
- Organisations retiring on-prem SIEM platforms
- Security teams moving from third-party SIEM tools to Microsoft Sentinel
- SOC programmes requiring a low-risk, phased migration approach
- Enterprises modernising detection and response workflows
- Teams seeking clearer cost and ingestion governance in SIEM operations
Objectives & deliverables
What Success Looks Like
- Migrate from a legacy SIEM to Microsoft Sentinel with minimal operational disruption
- Maintain or improve detection coverage throughout the transition
- Adopt Sentinel-native analytics, workbooks, and automation patterns
- Provide clarity on security coverage, costs, and ownership
- Leave the SOC with a supportable, modern operating model
What You Get
- Migration assessment report: current-state inventory, gaps, risks, and recommended approach
- Phased migration plan: sequencing of data sources, detections, dashboards, SOAR, and process changes
- Use-case mapping: legacy rules/use cases mapped to Sentinel analytics rule approach and content deployment plan
- Implemented pilot: priority sources + core use cases + workflows validated in Sentinel
- Cutover plan: go/no-go criteria, rollback considerations, and decommission plan for the legacy SIEM
- Operational handover: runbooks, training, and post-migration optimisation backlog
How It Works
- Discovery and inventory - capture current SIEM scope: sources, rules, dashboards, SOAR, and SOC processes.
- Plan and design - define migration phases, target architecture, data strategy, and side-by-side approach where needed.
- Pilot - onboard priority data sources, implement key detections and workflows, validate quality and SOC readiness.
- Scale - migrate additional sources and use cases in phases; translate dashboards to workbooks; build SOAR playbooks.
- Cutover - execute go/no-go criteria, switch primary operations to Sentinel, and decommission legacy tooling safely.
- Optimise - tune detections, refine processes, and deliver backlog-driven improvements after cutover.
Engagement Options
- Assessment - current-state SIEM review and Sentinel migration strategy
- Pilot - Sentinel side-by-side deployment with priority use cases
- Migration - phased migration of detections, dashboards, and workflows
- Optimise - post-cutover tuning and SOC process improvement
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.
SOAR Automation & Playbook Design
Design Microsoft Sentinel SOAR automation and playbooks that automate triage, enrichment and response, reducing analyst effort while improving incident consistency.
Log Analytics Cost Optimisation
Reduce Microsoft Sentinel and Log Analytics costs through ingestion controls, table strategy, retention and archive while preserving security outcomes.
Incident Response & Forensics
On-demand incident response and forensic triage to contain threats, preserve evidence, restore operations, and define practical improvements after incidents.
Frequently Asked Questions
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