In-Depth Sentinel Part 1: What is it and Why use it?
Microsoft Sentinel is Microsoft's cloud-native SIEM and SOAR platform. As organizations continue moving deeper into cloud services, it makes sense that security operations and event management increasingly need cloud-native tooling as well.
Sentinel is Microsoft's answer to that need, with support for ingesting signals from Microsoft 365, Azure, AWS, GCP, and on-premises systems into a single security operations platform.
What is Microsoft Sentinel?¶
At its core, Sentinel is built to help organizations collect, analyze, and respond to security-relevant events across hybrid and cloud environments.
It includes capabilities such as:
- threat intelligence ingestion
- investigation graphs
- MITRE ATT&CK coverage
- automation rules and playbooks
- prebuilt and custom analytics
- workbooks for visualization
- notebooks for deeper analysis
Because it is cloud native, Sentinel also scales without the organization having to manage the underlying infrastructure directly.
When and why to use Microsoft Sentinel¶
Teams evaluating SIEM platforms quickly discover that there is no shortage of choices. Sentinel sits in a crowded field, so the better question is not whether it is good on paper, but when it makes sense.
Here are three signals that often push Sentinel toward the top of the list.
1. Your organization is already invested in Microsoft 365 and Azure¶
If your collaboration stack, identity systems, and major workloads already live in Microsoft cloud, Sentinel benefits from deep first-party integration. The connector ecosystem, Microsoft XDR integration, and adjacency to automation tooling make it a particularly strong fit for organizations already committed to that platform.
2. You want your cloud provider to handle SIEM scale¶
Running a SIEM on-premises or in self-managed infrastructure means managing servers, storage, and long-term growth yourself. Sentinel sits on top of Log Analytics Workspace, a platform service that removes much of that infrastructure burden. There are still cost considerations, but the operational tradeoff is often worthwhile.
3. You need broad connector coverage¶
Large organizations rarely live in a single ecosystem. Sentinel supports a wide set of third-party connectors and solutions, allowing teams to ingest data from firewalls, SaaS platforms, other cloud providers, and custom sources. When a connector does not exist, Microsoft's codeless connector framework gives teams another path forward.
Microsoft Sentinel has a strong future¶
Sentinel has matured significantly over the last several years. I was first introduced to it in 2021 while still on active duty in the Navy, during a period when large-scale cloud migration and secure remote collaboration were urgent priorities. Even then, it was clear Microsoft was aiming for a platform that could provide near real-time visibility across environments and scale with the organization.
That direction has only become clearer. Sentinel continues to improve through tighter integrations, stronger automation, and more AI-assisted capabilities. For organizations looking for a cloud-native Microsoft-aligned SIEM, it remains a compelling option.
Part 2 of this series will focus on the deployment considerations organizations should think through before rolling out Sentinel for the first time.