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Microsoft 365 Security Review Services

Microsoft 365 Security Review Services

Microsoft 365 Security Review

Microsoft 365 is now the backbone of business productivity for companies around the world. Email, file storage, collaboration tools, identity management, and cloud apps all rely on Microsoft 365. This makes it one of the most valuable and most frequently targeted parts of your technology setup.

Cybercriminals are aware of this. Attacks like business email compromise, credential theft, ransomware, phishing, unauthorized sharing, and misconfigured cloud services target Microsoft 365 users of all sizes. While Microsoft offers strong security tools, many businesses do not set up all available protections or regularly check that their security settings follow best practices.

At Tanner Security, our Microsoft 365 Security Review Services offer an independent look at your Microsoft 365 setup. We identify security gaps, weak configurations, governance issues, and ways to improve your cybersecurity. Our consultants have over two decades of experience in Microsoft cloud security, identity and access management, governance, compliance, and cybersecurity to give you practical advice that lowers business risk and supports productivity.

Whether your company needs to prepare for a compliance check, meet customer security needs, renew cyber insurance, or just improve cloud security, our team can help make sure your Microsoft 365 setup is ready for today’s changing threats.

What Is a Microsoft 365 Security Review?

A Microsoft 365 Security Review is a thorough check of your security settings, governance practices, identity controls, collaboration options, and admin safeguards in your Microsoft 365 account.

A Microsoft 365 Security Review is not the same as a penetration test, which tries to find and use weaknesses, or a vulnerability scan, which looks for technical problems. Instead, this review checks if your setup is built to reduce the risk of account compromise, unauthorized access, accidental data leaks, and cloud attacks.

The review covers both technical controls and admin processes. It checks if your Microsoft 365 setup follows security best practices, meets regulatory requirements, and matches how your company works.

Why Microsoft 365 Security Reviews Matter

Many businesses believe Microsoft takes care of all security for Microsoft 365. While Microsoft protects the cloud infrastructure, customers still need to set up identity protections, access controls, data security, user permissions, and governance settings in their own accounts.

Because security is a shared responsibility, how administrators set up Microsoft 365 directly affects the safety of the entire environment.

Our Microsoft 365 Security Reviews help businesses spot misconfigurations before attackers can. We also help strengthen identity security, improve data protection, reduce insider risk, and support long-term governance.

Talk with a Microsoft 365 Expert Today

Take advantage of our customized approach to address your unique Microsoft 365 environment.

Our Microsoft 365 Security Review Methodology

We begin each project by understanding your business goals, regulatory needs, collaboration requirements, and how you use Microsoft 365 today.

Our consultants look at Microsoft Entra ID (which was previously known as Azure Active Directory), multi-factor authentication, Conditional Access policies, privileged administrative accounts, the Microsoft Defender settings, the security of Exchange Online, SharePoint Online, OneDrive, Microsoft Teams, the settings relating to external sharing, email authentication, logging and monitoring, retention policies, the data loss prevention controls, device management, and governance practices.

Rather than only checking settings against a list, we look at how your controls work together to reduce business risk and support your team’s collaboration.

At the end of our work, you get a detailed report that lists the risks we found, our top recommendations, configuration improvements, and the next practical steps to make your Microsoft 365 security stronger.

Common Security Risks We Evaluate

Every Microsoft 365 setup is different, but our reviews often find too many admin privileges, incomplete multi-factor authentication, weak Conditional Access policies, old authentication methods, risks from external sharing, misconfigured Teams settings, mailbox security problems, poor logging, not enough monitoring, gaps in data retention, inactive accounts, guest user risks, and ways to improve your Microsoft Secure Score.

Our goal is not just to raise a security score, but to make sure your security controls truly reduce risk and support your business operations.

Identity Security Is the Foundation of Microsoft 365

Most successful attacks on Microsoft 365 start with stolen or compromised identities, not software flaws.

Identity security is now one of the most important parts of protecting cloud environments. Strong authentication, least-privilege access, privileged identity management, Conditional Access, passwordless authentication, and ongoing monitoring all help prevent unauthorized access.

Our consultants review identity controls holistically to help businesses reduce the risk of credential theft and account takeovers.

We were fortunate to have collaborated with Tanner IT Security Consultants. From the outset, John’s team exhibited a remarkable depth of knowledge and a clear understanding of our specific requirements.

Andy W. – Chief Information Security Officer

Microsoft 365 Security and Compliance

Microsoft 365 Security conforms to a wide range of regulatory and contractual requirements, such as ISO 27001, HIPAA, CMMC, PCI DSS, SOC 2, the NIST Cybersecurity Framework.

No cloud platform makes a business compliant by default, but well-configured Microsoft 365 security controls can greatly help with compliance by improving access management, data protection, logging, monitoring, governance, and audit readiness.

We assist businesses in bringing Microsoft 365 security enhancements into line with their wider compliance efforts to get the most out of their security investments.

Microsoft 365 Security Review

Benefits of an Independent Microsoft 365 Security Review

An independent review gives leaders objective advice regarding the effectiveness of their Microsoft 365 security controls, and businesses typically find opportunities to improve their identity security, decrease unauthorized access, strengthen governance, protect sensitive information, improve the security of collaboration, enhance their regulatory readiness, and lower their overall cyber risk.

The report also gives executives the assurance that one of their most important business platforms is set up to support long-term security and resilience.

Why Choose Tanner Security?

Tanner Security has expertise in Microsoft cloud security, enterprise risk management, governance, penetration testing, compliance consulting, and information security auditing.

Since our consultants know that different businesses use Microsoft 365 in different ways, we do not suggest one-size-fits-all setups but instead give practical advice that considers security, usability, compliance, and business objectives.

No matter whether your company is adopting Microsoft 365 for the first time, enhancing its current setup, or getting ready for a security audit, we can assist you in creating a more secure and resilient cloud platform.

Ready to Strengthen Your Microsoft 365 Security?

The information that is most valuable to your company is stored in your Microsoft 365 environment. Having an independent security review carried out can help in the detection of any hidden risks, in strengthening identity protection, in improving governance, and in reducing the chance of a costly security incident.

Get in touch with Tanner Security now to arrange a Microsoft 365 Security Review and find out how our experienced consultants can assist your business in creating a more secure Microsoft cloud environment.

Related Microsoft 365 Security Review Services

A Security Review using Microsoft 365 is usually the first move taken when trying to strengthen your cloud security program. Companies combine this review with other cybersecurity and compliance services to improve governance, verify their security controls, and lower the total business risk.

Our related services include:

Together, these services help businesses build a mature cybersecurity program that protects cloud environments, supports compliance, and improves operational resilience.

Microsoft 365 Security Review FAQ’s

A Security Review for Microsoft 365 is an independent review of your Microsoft 365 tenant and looks at identity security, administrative controls, collaboration settings, governance, and cloud security configurations.

It can be used to detect security gaps, configuration weaknesses, and governance problems before attackers take advantage of them or before accidental data exposure takes place.

A penetration test tries to take advantage of any vulnerabilities to mimic a real-world attack, while a Microsoft 365 Security Review looks at how the environment is set up and checks whether the security controls conform to best practices.

Reviews usually look at Microsoft Entra ID, multi-factor authentication, Conditional Access, privileged access, Microsoft Defender, Exchange Online, SharePoint Online, OneDrive, Teams, external sharing, logging, monitoring, retention policies, and governance settings.

Microsoft is in charge of the underlying cloud infrastructure, while it is the customers’ responsibility to set up identity, access management, data protection, governance, and tenant security settings.

Yes. Microsoft 365 includes a wide range of security capabilities, but many features require proper licensing, configuration, and ongoing management to provide effective protection.

Microsoft Secure Score is a measurement that helps businesses understand how well their Microsoft 365 environment aligns with Microsoft’s recommended security practices. While useful, it should not be the only measure of security maturity.

In almost every environment, yes. Multi-factor authentication is one of the most effective ways to reduce the risk of compromised accounts and unauthorized access.

Conditional Access allows businesses to define rules that control access to Microsoft 365 based on factors such as user identity, device health, location, application, or risk level.

Most businesses should review their Microsoft 365 security settings at least annually and after significant licensing changes, mergers, cloud migrations, or major technology initiatives.

Yes. Many Microsoft 365 security controls support broader compliance initiatives, including ISO 27001, HIPAA, CMMC, PCI DSS, SOC 2, the NIST Cybersecurity Framework.

Yes. Collaboration platforms, external sharing settings, guest access, and file permissions are commonly evaluated as part of a comprehensive assessment.

Yes. We assist businesses with remediation planning, security configuration, governance improvements, policy development, identity management, and ongoing cybersecurity consulting.

The timeline depends on the size and complexity of the Microsoft 365 environment, the number of users, licensing, and the scope of the review. Many assessments are completed within several days to two weeks.

Any business that relies on Microsoft 365 for email, collaboration, file storage, identity management, or cloud productivity can benefit from an independent security review.

Microsoft 365 Security Review vs. Microsoft 365 Security Assessment: What's the Difference?

The terms Microsoft 365 Security Review and Microsoft 365 Security Assessment are often used interchangeably, but they can represent slightly different approaches.

A Microsoft 365 Security Review focuses on evaluating how your Microsoft 365 environment is configured today. It examines identity protection, administrative privileges, collaboration settings, data security, governance, and cloud configurations to identify opportunities for improvement and reduce cybersecurity risk.

A Microsoft 365 Security Assessment is often broader in scope. In addition to reviewing technical configurations, it may evaluate business processes, compliance requirements, user behavior, third-party integrations, security awareness, and the overall maturity of your cloud security program.

A helpful analogy is to compare a security review to a detailed inspection of a building’s locks, alarms, and surveillance systems. At the same time, a security assessment also considers how people use the building, who have access, and how security is managed over time.

Many businesses benefit from both approaches because they provide complementary insights. Together, they help leadership strengthen cloud security, improve governance, support compliance, and better protect the information stored within Microsoft 365.

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