Top M365 Security Monitoring Solutions for SMEs in 2026

With M365 security controls working properly, you don't have to worry about whether your environment is protected. Guard gives you a clear view of the risks and tells you what to do about them. As a growing SME, you're constantly facing new threats - your accounts are likely to be hit by hundreds of login attempts a month.

In this article, we'll go through 12 critical features you should demand from your M365 security monitoring solution. The list will help you assess whether your current solution is sufficient or whether you need better visibility into the security of your environment.

Quick guide: 5 key M365 security solutions for SMEs

1. Vahti: The best end-to-end solution for M365 security monitoring and risk prioritisation
2. Microsoft Defender for Office 365: Built-in protection against email threats
3. Microsoft Entra ID: Identity management and access control
4. Microsoft Purview: Security and compliance management tools
5. Azure Monitor: Log management and event monitoring

How we selected the best M365 security solutions for SMBs

We selected these solutions based on our hands-on experience with the needs of SMEs. We evaluated each solution's ability to identify threats, prioritise risks and facilitate remediation. Here are the criteria we used:

• Level of automation: how much does the solution automate threat detection and alerts so you don't have to manually monitor around the clock?
• Risk prioritization: does the solution clearly show which risks require attention immediately and which can wait?
• Plain language: can a non-technical person understand reports and instructions without deep security knowledge?
• Remediation: are you getting practical step-by-step steps to remediate risks?
• Ease of deployment: How quickly can you get the solution up and running without a complex installation process?
• Compatibility with M365 environment: Does the solution work seamlessly through Microsoft's official interfaces?

How does the M365 solution work with the Microsoft Windows Platform?

1. Vahti

Vahti is a Finnish security software that monitors your Microsoft 365 environment and identifies risks before they become problems. The solution consolidates security information into a clear view that gives you an at-a-glance view of the true state of your environment.

Vahti automatically prioritises risks in order of criticality. You get clear remediation instructions that allow you to act on your own without an IT consultant. Deployment takes just minutes when you connect the Vahti to your M365 environment via Microsoft's official interfaces.

Vahti features

• Risk prioritisation: Vahti automatically assesses which risks require immediate attention and which can wait - you always see the most critical threats first
• Account hijacking prevention: Vahti identifies anomalous logins and threats that could lead to account misuse
• Data leakage prevention: Vahti shows external share links and exposes dangerous files before information falls into the wrong hands
• Application management: see which third-party applications are connected to your environment and what rights they have
• Easy-to-understand patching instructions: step-by-step, Vahti tells you what to do - you don't need deep technical knowledge
• 24/7 monitoring: Vahti monitors your environment around the clock and alerts you to anomalies

Vahti: pros and cons

Pros:

• Finnish solution for Finnish companies - support and documentation in Finnish
• Fast deployment in minutes without complex installation
• No changes to your environment - read-only access

Worth noting:

• Focuses on Microsoft 365 environment - other cloud services require separate solutions
• Fixes are done manually or forwarded to an expert - Vahti does not make automatic changes
• Best suited for organisations that want to understand their risks themselves rather than outsource everything

2. Microsoft Defender for Office 365: Built-in protection against email threats

Microsoft Defender for Office 365 is Microsoft's own solution to combat email threats. It scans incoming messages, attachments and links for malware and phishing attacks. The solution is part of the M365 licensing packages and integrates directly with Exchange Online.

Defender leverages Microsoft's global threat database to quickly identify new threats. You'll receive alerts for suspicious messages and can set policies to automatically block dangerous content.

Microsoft Defender for Office 365 features

• Safe Attachments: open attachments in a safe sandbox to scan for malware before delivery
• Safe Links: checks links with a click and blocks access to malicious sites
• Anti-phishing: Detects phishing attempts and flags suspicious messages

Microsoft Defender for Office 365: pros and cons

Pros:

• Integrated directly into the M365 environment - no separate installation
• Integrates with Microsoft's extensive threat database
• Automatically runs in the background without the user noticing

Worth noting:

• Requires E5 license or separate add-on for full capabilities
• Reports are technical and require expertise to interpret.
• Focuses on email - wider visibility requires other tools

3. Microsoft Entra ID: Identity management and access control

Microsoft Entra ID (formerly Azure Active Directory) manages user identities and access rights in an M365 environment. You can define who has access to what and under what conditions. Conditional access allows you to create login rules based on location, device and risk.

Entra ID includes reports on risky logins and user accounts. Premium versions bring additional features such as automatic risk assessments and identity protection.

Microsoft Entra ID features

• Conditional access: set rules to block logins from high-risk locations or devices
• MFA management: enable multi-factor authentication for all or selected users
• Risk reports: view a summary of risky logins and user accounts

Microsoft Entra ID: pros and cons

Pros:

• Included in all M365 licenses as a basic feature
• Conditional access enables granular login rules
• Integrates with other Microsoft products

Worth noting:

• Advanced features require a P1 or P2 license
• Configuration of settings requires technical expertise
• Reports only cover the identity level - the big picture requires other tools

4. Microsoft Purview: privacy and compliance management

Microsoft Purview brings together privacy, data management and compliance tools. You can classify sensitive data, set retention periods and prevent data from being shared with the wrong parties. Data Loss Prevention (DLP) policies automatically identify sensitive content.

Purview also includes audit logs to see who did what and when. Compliance Manager helps you assess compliance status against various standards.

Microsoft Purview features

• DLP policies: prevent sensitive information from being shared outside the organisation
• Confidentiality flags: automatically classify files and emails based on content
• Audit logs: monitor user activity and identify anomalies

Microsoft Purview: pros and cons

Pros:

• A comprehensive tool for data protection and compliance
• Automatic content classification saves time
• Deep integration with M365 applications

Worth noting:

• Full features require E5 license or add-ons
• Time-consuming deployment and policy definition
• Report interpretation requires familiarity

5. Azure Monitor: Log management and event monitoring

Azure Monitor collects log data from your M365 environment and other Azure resources. You can create alerts based on specific events and visualize the data with summary views. Log Analytics allows you to query log data.

The solution is ideal for organizations with the technical expertise and need to build customized monitoring views. Integration with other Azure services is seamless.

Azure Monitor features

• Log Analytics: query log data and identify anomalies
• Alerts: set up automatic alerts based on specific events
• Summary views: Build visual views of log data

Azure Monitor: pros and cons

Pros:

• Flexible tool for customized log management
• Integrates with the Azure ecosystem
• Scales to large environments

Worth noting:

• Requires technical expertise to create queries and alerts
• Does not include pre-built security views - you build them yourself
• Costs increase with the amount of log data

M365 security monitoring solutions

Why is M365 security monitoring automation important for SMEs?

Automation reduces the need for manual work and ensures that threats are detected quickly. SMEs rarely have the resources to monitor logs around the clock, so an automated system is a practical necessity.

According to the Cybersecurity Centre's guidelines, the deployment of monitoring logs is one of the most important security measures. Logs help track when, what and how a potential data breach occurred.

Automated risk prioritisation saves time by not having to go through hundreds of alerts every day. Vahti does this for you, showing only those risks that require action.

How does risk prioritisation help you manage your security?

Risk prioritisation means that you see the most critical threats first. When resources are limited, it's essential to focus on the risks that have the greatest impact on your business.

Prioritisation is typically based on the severity of the risk, the likelihood of exploitation and the potential consequences. Vahti automatically assesses these factors and ranks the risks in a clear order.

Without prioritisation, you may spend time on less critical findings while more serious threats go unnoticed. A risk-based approach makes security work more efficient.

Why Vahti is the best M365 security monitoring solution for SMEs

Vahti combines automation, risk prioritization and plain language in a way that other solutions don't offer. Microsoft's proprietary tools are technical and scattered across different management views. Vahti brings security together in one clear view.

It makes security understandable. You don't need to be an expert to interpret reports or know what to do. Guard guides you step-by-step through the remediation process, so you can do it yourself or pass the task on.

For clear visibility into the security of your M365 environment, try Vahti for free and see for yourself how much easier security management can be.

Frequently asked questions about monitoring M365 security

What is included in M365 security controls?

M365 security controls include logon tracking, access management, file sharing controls and application permission checking. Vahti combines these into a single view and automatically prioritizes risks.

How often should my M365 environment be monitored?

You should monitor your M365 environment on an ongoing basis. Threats don't take breaks, so an automated solution is a practical necessity. Vahti monitors your environment 24/7 and alerts you to anomalies.

Is MFA enough to ensure M365 security?

MFA is an important starting point, but it's not enough on its own. Attackers have developed methods to circumvent MFA, such as AiTM attacks. Vahti identifies these threats as well and helps you protect yourself holistically.

How quickly can M365 security monitoring be deployed?

It takes a few minutes to deploy the Vahti. You connect Vahti to your M365 environment, scanning starts automatically and you get your first results quickly. Configuring Microsoft's own tools takes significantly more time.

What is the difference between log collection and security monitoring?

Log collection captures events, but doesn't tell you what they mean or what to do. Vahti analyses the logs, identifies anomalies and provides action recommendations in plain language.