How to Prepare for a Microsoft 365 Audit

Learn how to prepare for a Microsoft 365 security audit with CIS benchmarks, automation, and a practical m365 compliance checklist.

Preparing for a Microsoft 365 security audit can feel a bit overwhelming, especially if it’s your first formal review of cloud security and compliance. Between Exchange Online, SharePoint, Teams, OneDrive, and Entra ID (formerly Azure AD), there are just a lot of moving parts.

The good news is you don’t need to guess your way through it. By aligning with the CIS Benchmark for Microsoft 365, building a repeatable m365 compliance checklist, and using a bit of smart automation, you can turn a stressful audit into a fairly predictable process.

In this guide, we’ll walk step-by-step through how to prepare for a Microsoft 365 security audit, with practical examples, a clear approach to the cis benchmark microsoft 365, and ideas for microsoft 365 compliance automation that actually save you time instead of adding more work.

Understand the Scope of Your Microsoft 365 Audit

Before you change a single setting, you need clarity on what is being audited and why. Scope definition is usually where things go sideways if you skip it.

Clarify audit objectives and frameworks

Start by asking a few very direct questions to your auditor, internal security team, or external assessor:

Is this a general m365 security audit, or is it tied to a specific certification (SOC 2, ISO 27001, HIPAA, NIS2, etc.)?
Is Microsoft 365 in-scope only for collaboration (email, Teams, SharePoint), or does it also include identity (Entra ID), devices (Intune), and cloud apps (Defender for Cloud Apps)?
Which security baseline or benchmark should we align to?

In many organizations, the cis microsoft 365 foundations benchmark is used as the technical baseline for Microsoft 365 hardening. Even if your main goal is something like ISO 27001 or SOC 2, the cis benchmark microsoft 365 gives you a very concrete set of 129 controls to work through.

To be honest, if you don’t get this clarity up front, you risk over-preparing in the wrong areas and under-preparing where the auditor actually cares.

Map Microsoft 365 to your business and data

Next, define how Microsoft 365 is used in your environment and what data lives there. Create a simple, pragmatic view:

Which business units rely on M365 (HR, Finance, Sales, Legal, Operations)?
What sensitive data is stored or shared in M365 (PII, PHI, card data, internal IP, contracts)?
Which workloads are in active use (Exchange, SharePoint, OneDrive, Teams, Power Platform)?
Are there any guest users, B2B collaboration, or external sharing scenarios?

This directly influences your m365 security assessment priorities. For example, if Finance uses SharePoint and OneDrive for payroll files, external sharing and DLP settings instantly become more critical. If HR runs recruiting entirely via email and Teams, that changes what the auditor will focus on.

Once you’ve got this picture, you can line it up with the cis benchmark microsoft 365 controls and decide which areas are high priority for your audit preparation.

Build a Practical M365 Compliance Checklist

With scope defined, you can now build a structured m365 compliance checklist instead of jumping randomly into the admin center. This is where the CIS Microsoft 365 Foundations Benchmark really helps.

Use CIS Benchmark Microsoft 365 as your baseline

The cis microsoft 365 foundations benchmark provides prescriptive guidance for locking down Microsoft 365 across identity, access, logging, and data protection. It’s broken into Level 1 (Essential) and Level 2 (Enhanced) profiles.

A practical way to turn that into an actionable checklist:

1. Download or review the CIS Benchmark for Microsoft 365 (latest version) from the Center for Internet Security.
2. Highlight Level 1 controls as non-negotiable for your environment. These are your essential hygiene items.
3. Flag relevant Level 2 controls where your risk profile or regulations demand stronger protection (for example, admin MFA, strict conditional access, advanced auditing, or stricter sharing policies).
4. Tag each control with one of three labels:

Already compliant
Needs configuration change
Needs evidence only

Now you’re not just “hardening M365” in theory—you’ve got a concrete cis benchmark microsoft 365 guide to follow, tied directly to your audit preparation.

Turn the benchmark into real settings and evidence

An auditor cares about two things: configuration and proof.

For each CIS control or checklist item, note:

Where to configure it (Entra admin center, Exchange Online, SharePoint admin, Teams admin, Purview, Defender portal, etc.)
What evidence you’ll provide (screenshot, export, policy document, or automated report)

Some very typical items on an m365 compliance checklist include:

MFA enabled for all users and especially admins
Conditional Access policies enforcing strong authentication
Security defaults or equivalent baseline applied
Mail flow rules for anti-phishing and anti-spoofing
Safe attachments and Safe links protections
Audit logging and unified audit log enabled
Retention policies for critical mailboxes and sites
External sharing restrictions for SharePoint and OneDrive

As you work through your checklist, capture evidence as you go. It’s boring, but it’s what makes your microsoft 365 audit preparation solid instead of last-minute scrambling.

Harden Identity, Access, and Authentication First

In almost every m365 security audit I’ve seen, identity and access management is where auditors spend the most time. It’s also where misconfigurations cause the biggest damage.

Secure administrator and privileged access

Start with your admin accounts and high-privilege roles. For the CIS controls and a typical m365 security assessment, you’ll want to ensure:

All global admins and privileged roles use MFA, ideally via Conditional Access
There are no shared admin accounts without proper break-glass handling
Number of global admins is limited and justified
Privileged Identity Management (PIM) is used where available for just-in-time access

Document:

A list of your admin roles and assigned users
Screenshots or reports from Entra ID showing MFA and Conditional Access status
Any procedure you use for break-glass accounts (e.g., emergency access accounts with strict monitoring)

These directly support multiple cis benchmark microsoft 365 controls and are usually low-hanging fruit to fix before the audit.

Tighten user authentication and sign-in policies

Next, look at how standard users authenticate. For a strong microsoft 365 compliance posture:

Enforce MFA for all user accounts, especially those with mailbox or SharePoint access
Remove legacy authentication where possible
Use Conditional Access to block risky sign-ins, geographies you don’t operate in, or impossible travel
Configure sign-in risk and user risk policies (if licensed) to respond to suspicious behavior

Auditors will often review sign-in logs, risk events, and Conditional Access policies. Don’t wait until the day before to discover gaps—test your policies, review sign-in logs, and make sure your enforcement matches your policies on paper.

Strengthen Data Protection and Collaboration Controls

Once identity is reasonably locked down, focus on where data actually lives: Exchange, SharePoint, OneDrive, and Teams. This is especially relevant if you deal with regulated or sensitive information.

Review external sharing and guest access

External collaboration is one of the most common weak spots in a microsoft 365 security audit. Things to check:

SharePoint and OneDrive external sharing defaults (organization-level and site-level)
Whether anonymous sharing links are allowed and for which data
Guest access configuration in Teams and Entra ID
Lifecycle management of guest accounts (when and how they are removed)

Map this to your real-world use: if your organization works heavily with partners, you may need more nuanced controls, not just “disable everything.” Document the business case and show how security is balanced with collaboration.

Align retention, DLP, and eDiscovery with requirements

For many companies, especially in regulated industries, auditors will look closely at:

Retention policies for email, Teams chats, and SharePoint/OneDrive content
Data Loss Prevention (DLP) policies for sensitive information types (like PII, PHI, or cardholder data)
eDiscovery capabilities and access controls around them

Here it’s worth being honest about what’s truly needed. Overly aggressive retention (keeping everything forever) may conflict with privacy regulations, while under-retention can hurt you in legal or regulatory investigations.

Make sure your policies:

Are documented at the policy level (in your ISMS or security docs)
Match the actual configuration in Purview or the compliance center
Have clear ownership and change management

This alignment is a big part of mature microsoft 365 compliance rather than just technical box-ticking.

Automate Assessment and Detect Configuration Drift

Manually checking 129 CIS controls once before the audit is… workable. But keeping them in line over months is where things get painful. This is where microsoft 365 compliance automation becomes extremely valuable.

Use automated M365 compliance assessment tools

If you rely only on one-off manual checks, configuration drift will eventually bite you. A new admin changes something, a policy gets relaxed for a project, or a new feature appears with insecure defaults.

Automated m365 compliance assessment tools can significantly reduce this risk by:

Continuously scanning your tenant against the cis microsoft 365 foundations benchmark
Highlighting gaps for both Level 1 and Level 2 profiles
Generating evidence and audit-ready reports without manual screenshot marathons

For example, ConfigCobra is a dedicated automated cloud compliance platform for Microsoft 365 that:

Assesses all 129 CIS Microsoft 365 Foundations Benchmark controls
Supports Level 1 (Essential) and Level 2 (Enhanced) profiles
Runs scheduled assessments (daily, weekly, monthly) so you can spot issues early
Generates PDF reports with remediation guidance and mapped controls
Detects configuration drift in near real-time

This kind of automation doesn’t replace your security team—but it does dramatically cut down the repetitive parts of microsoft 365 audit preparation.

Map CIS to your wider compliance landscape

Most organizations today aren’t only dealing with one framework. You might be juggling SOC 2, ISO/IEC 27001, NIS2, HIPAA, PCI DSS, or internal policies at the same time.

One major advantage of using a cis benchmark microsoft 365 guide plus automation is that CIS controls can be mapped to multiple standards. Tools like ConfigCobra can align CIS controls to frameworks like NIST CSF, ISO 27001, GDPR-related controls, and others, so you’re not reinventing the wheel for each audit.

This means:

A single m365 security assessment can serve multiple audits
You can show auditors traceability from technical Microsoft 365 controls to their preferred framework
You build a living, reusable compliance asset instead of a one-time, dusty audit binder

In my experience, auditors appreciate this level of traceability; it shows you’re treating microsoft 365 compliance as an ongoing program rather than a once-a-year fire drill.

Preparing for a Microsoft 365 security audit doesn’t have to be a mad rush of screenshots and guesswork. If you:

Clearly define the audit scope and your in-scope M365 workloads
Use the cis benchmark microsoft 365 as your concrete technical baseline
Build a practical m365 compliance checklist tied to real settings and evidence
Prioritize identity, access, and data protection controls
Lean on microsoft 365 compliance automation to continuously assess and detect drift

…you’ll walk into the audit far more confident—and with fewer surprises.

If you’re ready to move beyond manual checks and spreadsheets, it’s worth looking at tools that automate compliance for Microsoft 365. ConfigCobra, for example, continuously evaluates your tenant against the CIS Microsoft 365 Foundations Benchmark, maps controls to multiple standards, and produces audit-ready reports that make both internal reviews and external audits much smoother.

You can explore how ConfigCobra can support your automated m365 compliance assessment and streamline your next audit at https://configcobra.com/compliance Even if you start with a smaller scope or a trial, getting that continuous visibility in place now will make every future microsoft 365 security audit easier, faster, and honestly a lot less stressful.