Microsoft Defender for Office 365 is Microsoft’s email and collaboration security platform, helping organisations defend against phishing, malware, ransomware, malicious links, and business email compromise. Protection extends across Exchange Online, Microsoft Teams, SharePoint, OneDrive, and Microsoft 365 applications.

At Zenzero, we help organisations configure and optimise Defender for Office 365 to strengthen protection, improve visibility, and support faster response to threats across their Microsoft environment.

02.

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Microsoft Sentinel

Gain complete visibility across your environment with Microsoft's cloud-native SIEM and SOC platform.

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Microsoft Entra Support

Strengthen identity security and control access across users, devices, applications, and cloud services.

Email remains one of the most common entry points for cyber attacks, which is why getting the configuration right is just as important as having the technology in place. At Zenzero, we help organisations move beyond default settings and optimise Microsoft Defender for Office 365 around their users, business processes, and risk profile.

Our team reviews your existing Microsoft 365 security posture, identifies gaps, and configures the right combination of Safe Links, Safe Attachments, anti-phishing controls, and security policies. We also tune protection for high-risk users, helping to reduce false positives while maintaining strong security controls.

By integrating Defender for Office 365 into your wider Microsoft security strategy, we help create a more connected approach to threat detection, investigation, and response. The result is stronger protection across email and collaboration tools, improved visibility for IT teams, and a more resilient Microsoft 365 environment.

Microsoft Defender for Office 365 is Microsoft’s cloud based security solution for email and collaboration security. It helps defend users against sophisticated threats that can arrive through Exchange Online mailboxes, Microsoft Teams, SharePoint Online, OneDrive and Microsoft 365 apps. It checks messages, links and attachments using Microsoft security intelligence, online protection and EOP protection capabilities, helping identify malicious content before, during and after delivery.

Reduce phishing risk

Block more malicious emails, harmful emails, links and attachments before they reach users.

Protect collaboration

Extend protection beyond inboxes into Microsoft Teams, SharePoint Online, OneDrive, Microsoft 365 apps and other cloud apps.

Respond faster

Give IT and security teams clearer visibility into threats and affected users.

Support compliance

Strengthen security controls around sensitive communications, sensitive information, internal email and business data.

Improve confidence

Give users safer ways to work, communicate and collaborate in Microsoft 365.

Lower security complexity

Cost efficient integration eliminates the need for third party secure email gateways in many Microsoft 365 environments, reducing licensing overlap, administration overhead and disconnected security reporting.

Defender for Office 365 helps organisations protect against phishing, malware, malicious links, unsafe attachments, and business email compromise. We work with you to ensure protection is aligned to your users, business processes, and risk profile.

From Safe Links and Safe Attachments to anti-phishing policies and threat investigation capabilities, we help businesses get more value from Microsoft Defender for Office 365 while maintaining strong security controls and reducing unnecessary complexity.

"We know the right expert is always at the other end of the phone if we need them. The benefit of outsourcing means we have the ability to call on the right expertise at the right time, we can always draw on the skillset that we need."

Garry Collins

Administration and Finance Manager, St John

"The project was very well planned, exceptionally well executed and smoothly implemented. The team were wonderful, the project was delivered on time and on budget, and we received great support all the way through. I couldn’t fault it."

Andrew Everton

Executive Director, Saffery Trust

"They’ve become more than a service provider; they are a trusted partner. This partnership between Solent Mind and Zenzero allows us to adapt and evolve more quickly, leading to improved services and outcomes for our users."

Robert Wayman

FEE & Director, Solent Mind

Safe Links protection

Checks URLs at time of click, helping block links that become malicious after an email has already been delivered.

Safe attachments protection

Opens suspicious attachments in a protected virtual environment to detect malware, ransomware, zero day malware and other harmful content before users interact with them.

Anti-phishing and impersonation protection

Helps detect spoofing, domain impersonation and user impersonation attempts that are often used in business email compromise attacks. AI driven impersonation protection uses large language models to detect spoofing patterns and suspicious sender behaviour that may not be obvious from the message content alone.

Threat investigation and response

Gives security teams threat explorer, detailed information and the tools to investigate advanced threats, understand who was affected, review real time detections and take action quickly.

Preset and custom security policies

Microsoft Defender defines three preset policies and security profiles: built-in, standard protection and strict protection. These help organisations apply Microsoft recommended protection levels quickly, manage protection settings through global settings, and still allow custom policies where specific recipients, departments or risk levels require more specific controls.

Security awareness support

Helps organisations combine technical controls with user education, reporting processes and practical guidance.

Doesn’t Microsoft 365 already filter spam and malware?

Basic filtering exists, but Defender for Office 365 adds far stronger protection against sophisticated phishing, malicious links and attachments, and business email compromise - plus the investigation and response tools to deal with what gets through. It hardens your most-targeted attack surface and builds on Exchange Online Protection with additional security service features and add ons.

Can it stop phishing entirely?

No tool catches everything, but it dramatically reduces malicious messages reaching inboxes and speeds up response when one does. We tune policies to catch threats without disrupting legitimate communication, and pair the technology with guidance so people become part of the defence.

What about links that are safe when sent but weaponised later?

Defender checks links at time-of-click as well as on delivery, so a link that becomes malicious after the email arrives is still caught. That real-time checking is a key advantage over basic filtering.

Does Defender for Office 365 protect Microsoft Teams and SharePoint?

Yes. Defender for Office 365 can help protect collaboration across Microsoft 365, including supported scenarios in Microsoft Teams, SharePoint, OneDrive and Microsoft 365 apps, not just email.

Can Zenzero configure Defender for Office 365 for high risk users?

Yes. We can apply stronger protection for users who are more likely to be targeted, such as directors, finance teams, senior leaders, specific recipients and people with access to sensitive systems or data.

Can Defender for Office 365 replace a third party secure email gateway?

In many Microsoft 365 environments, yes. Because Defender for Office 365 is integrated into Microsoft 365, it can reduce or remove the need for a separate secure email gateway, depending on your current configuration, compliance requirements and risk profile. Zenzero can assess whether consolidation is appropriate and help plan the transition safely.

What are Microsoft Defender preset security profiles?

Microsoft Defender defines three preset security profiles: built-in, standard protection and strict protection. Built-in protection gives baseline coverage, Standard applies a balanced Microsoft-recommended configuration for broad use, and Strict applies more aggressive settings for users who are more likely to be targeted or who need stronger controls.

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