---
title: "Secure Microsoft 365 Access"
description: "Enforce secure Microsoft 365 access with MFA at the AD authentication level. Learn more about UserLock MFA & SSO for hybrid AD environments."
locale: "en"
updated_at: "2026-05-06T14:01:04.953Z"
canonical: "https://www.isdecisions.com/en/userlock/solutions/secure-microsoft-365-access"
---

# Secure Microsoft 365 access with Active Directory identities

_Use Case_

Enforce secure Microsoft 365 access with access controls at the AD authentication level. With UserLock, apply identity-based access security for Microsoft 365 using your existing Active Directory (AD) setup. No need to move identity to Entra ID, juggle multiple tools, or add complexity.

## The Microsoft 365 security gap for on-prem AD

For most organizations, Microsoft 365 is at the core of day-to-day work. But for IT teams with infrastructure built around on-premises AD, MS 365 security is an uphill battle.

Microsoft doesn’t support conditional access with the on-prem AD identity. AD security defaults don’t offer two-factor authentication, period. And Microsoft Defender or third-party authentication apps require an Entra ID tenant. Plus, bolting on complex tools often leads to inconsistent policies, confused users, and added cost.

Relying on Microsoft’s cloud-native identity security solutions can:

- Add complexity with multiple identities, directories, and MFA systems
- Create blind spots between on-prem and cloud services
- Require high-costs licenses costs like Microsoft Entra ID P1 / P2

## How UserLock secures Microsoft 365 access without identity rewiring

Federate authentication for on-prem AD identities to secure access to Microsoft 365 and SaaS apps. With UserLock single sign-on (SSO), apply multi-factor authentication (MFA) and context-based access controls. No need to ask users to sign in again or change directories.

## Comprehensive Microsoft 365 access security

### Enforce MFA for Microsoft 365 using AD credentials

Enforce MFA for Microsoft 365 and Exchange Online logins. No need for a cloud-based identity provider (IdP). Enforce MFA policies granularly by AD user, group, and OU, and set different MFA prompt frequency by session type.

### Combine MFA with SSO

Implement single sign-on (SSO) to extend strong on-prem authentication and access controls to Microsoft 365 access. Users complete MFA once at the Windows login, and UserLock SSO federates authentication to MS 365 and other SaaS apps.

### Apply context-based controls

Set login restrictions based on users and devices, location, time, and session type, before users access cloud services.

### Centralize real-time monitoring and response

Track logins across SaaS and on-prem AD access for compliance and to improve security. Detect suspicious behavior and block sessions or users instantly.

### Audit and report on MS 365 access

Create personalized reports on all Microsoft 365 access. Prove you have the necessary access controls in place for compliance and cyber insurance requirements.

### Prove compliance

Produce clear reports of who accessed what, when, and from where, no manual logs required.

## Why IT teams choose UserLock for Microsoft 365 security

#### Unified access security

Set policies in one platform for all local, remote, and SaaS logins.

#### Simple MFA enforcement

Protect access to Microsoft 365 without disrupting how users sign in.

#### No cloud lock-in

Avoid costly migration to Entra ID and reduce dependence on third-party identity.

#### Instant visibility and response

See who logs on, where, and how in real time. Block, log off, or disable an account with one click the moment a session looks risky.

#### Flexible deployment

Deploy UserLock easily thanks to a lightweight agent, fast setup, and no AD schema changes.

#### Audit-ready visibility

Generate searchable logs of all login events and prove compliance easily.