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Microsoft 365 security
Microsoft 365 security consultancy and implementation
Stop phishing, control external sharing and rein in risky app permissions across Microsoft 365. Konsolute assesses and implements security for Exchange Online, Teams, SharePoint and OneDrive, using Defender for Office 365 where your licences allow.
WHAT THIS HELPS YOU ACHIEVE
Secure the way your people communicate and collaborate
Microsoft 365 security settings span several services and administration layers. We connect those controls around real business scenarios, so protection, external collaboration and day-to-day support work together.
Reduce email exposure
Improve the protection and handling of suspicious messages while accounting for legitimate senders and business mail flows.
Control external sharing
Align guest collaboration, sharing links and site access with the sensitivity of the information and the needs of its owners.
Limit application access
Review the permissions applications hold and establish an accountable process for consent and ongoing ownership.
Make protection operable
Test policies, document exceptions and give support teams clear procedures for alerts, quarantine and configuration changes.
OUR MICROSOFT 365 SECURITY SERVICES
Practical Microsoft 365 security services
Choose a targeted configuration review, email protection deployment or wider security improvement programme. We define the workloads, controls and operational responsibilities before implementation.
Exchange Online security
Review mail flow rules, connectors, mailbox forwarding and protection settings. Find overly broad exceptions and check SPF, DKIM and DMARC with the owners of every legitimate sending service.
Defender for Office 365
Implement anti-phishing, Safe Links and Safe Attachments where licensed. Check how preset and custom policies interact, how quarantine is handled and how users report suspicious messages.
SharePoint & OneDrive sharing
Review organisation, site and OneDrive sharing alongside existing permissions and links. Set sensible defaults, owners and remediation for sensitive content, then test real collaboration journeys.
Teams & guest collaboration
Align Teams guest access, external access and the group and SharePoint settings behind them. Treat chat and meetings separately from membership and file access, recording partner needs and owners.
Application consent & permissions
Review enterprise app consent and Microsoft Graph permissions that reach Microsoft 365 data. Set up approval and ownership, and plan permission changes around the integrations you depend on.
Security operations & handover
Define alert routing, quarantine responsibilities and investigation procedures. Capture configuration baselines, test evidence and exception reviews, with ongoing monitoring scoped separately.
CAPABILITIES & DELIVERY SCOPE
Security across email, content, collaboration and connected applications
We review effective control coverage rather than treating every enabled setting as complete protection. Implementation considers policy precedence, workload boundaries and the capabilities available in your subscriptions.
Mail flow & sender trust
Review how messages enter and leave the tenant, including legitimate third-party senders, connectors and any configuration exceptions in place.
- Mail flow rules and connector dependencies
- Forwarding and sender authentication configuration
- Allowances, bypasses and exception ownership
Threat protection policies
Design protection policies around recipient scope and business needs, then test delivery and quarantine handling before wider deployment.
- Anti-phishing and impersonation settings where supported
- Licensed Safe Links and Safe Attachments coverage
- Policy precedence and quarantine responsibilities
SharePoint & OneDrive controls
Align sharing settings with each site's purpose and the sensitivity of its content, reviewing existing access as well as defaults for new sharing.
- Organisation and site sharing boundaries
- Sharing link defaults and existing permission review
- Content owner approval and remediation testing
Teams collaboration boundaries
Map the settings behind each external collaboration scenario, recognising that Teams file access also depends on SharePoint and group permissions.
- Guest membership and external communication settings
- Meeting policies for agreed collaboration scenarios
- Group ownership and connected site access
Application consent
Identify which apps can access Microsoft 365 information and who is accountable for each, then check permissions against real integration needs.
- Delegated and application permission inventory
- Consent approval and application ownership
- Dependency testing before permission removal
Information protection dependencies
Assess whether a sharing scenario needs classification or DLP controls, and scope any Microsoft Purview implementation as its own workstream.
- Sensitive information scenarios and access expectations
- Supported label and DLP requirements where in scope
- Licensing and business validation dependencies
Investigation & response preparation
Make the path from alert to action clear. Investigation depends on the services you are licensed for, the evidence available and log retention.
- Alert routing and escalation ownership
- Quarantine review and message investigation procedures
- Response authority and support boundaries
Configuration assurance
Document the implemented baseline and how it is maintained, tracking exceptions and validating changes against agreed collaboration scenarios.
- Before-and-after configuration evidence
- Policy exceptions and scheduled review ownership
- Change control and handover documentation
TECHNICAL DESIGN DECISIONS
Protection that accounts for legitimate business activity
Restricting every route is rarely a workable security design. We identify genuine collaboration and communication requirements, then implement controls with explicit scope, validation and ownership.
Policy precedence
Evaluate how preset and custom protection policies combine. Check recipient assignments and exclusions rather than assume one policy covers every user.
Connected permissions
Review Teams, Microsoft 365 groups and SharePoint access together. Sharing settings and existing permissions are related controls that both need attention.
Tested exceptions
Record the reason, owner and review date for every exception. Avoid blanket allowances where a narrower supported configuration meets the requirement.
Controlled deployment
Pilot changes with representative users and partners. Check that legitimate email, document access and support procedures work before wider enforcement.
OUR APPROACH
How we deliver Microsoft 365 security
Six stages take each change from a baseline of your tenant to tested, staged enforcement, with legitimate email and collaboration checked at every step.
Discover & baseline
Inventory the agreed services, policies, sharing patterns and integration dependencies.
Design controls
Agree target settings, licensing requirements and prioritised implementation actions.
Prepare operations
Define quarantine, alert, exception and change responsibilities before rollout.
Pilot & test
Test representative users, legitimate senders and external collaboration journeys.
Implement changes
Deploy approved settings in stages and investigate unexpected outcomes.
Hand over & review
Provide configuration records, test results and ongoing review procedures.
Protect.Share.Review.
WHERE MICROSOFT 365 SECURITY CAN HELP
Start with the Microsoft 365 security gap that matters most
A focused engagement can address a specific workload or establish a wider tenant improvement programme. We confirm the evidence, access and business dependencies during discovery.
- Review email protection after phishing or impersonation concerns
- Resolve inconsistent Defender policy coverage and unmanaged exceptions
- Reduce broad SharePoint or OneDrive external sharing
- Establish clear Teams guest and partner collaboration boundaries
- Review application permissions granting access to organisational information
- Prepare support teams to manage quarantine, alerts and policy changes
See it in practice: Konsolute built a Zero Trust Microsoft 365 tenant for Great British Energy – Nuclear, with email, sharing and collaboration controls set up securely from the start.
WHAT WE DELIVER
Working controls with evidence and operational ownership
Deliverables reflect the agreed assessment and implementation scope. Your team receives the decisions, configuration records and procedures needed to understand and maintain the result.
Security baseline & findings
A scoped configuration review and prioritised action register identifying affected workloads, evidence and implementation dependencies.
Control design & configuration
Documented policy scope, sharing decisions, consent requirements and approved exceptions for the implemented workstreams.
Validation evidence
Pilot results and representative test outcomes for mail delivery, protection handling, access and external collaboration.
Support & review runbooks
Guidance for agreed quarantine, alert and exception processes, with named ownership and a review backlog.
FAQ
Microsoft 365 security FAQs
Email protection, Defender, sharing, Teams guests, apps and monitoring.
We assess and implement agreed controls across Exchange Online, Teams, SharePoint, OneDrive and connected application access. Work can include email protection, external sharing, consent and operational handover. We identify the workloads, licences, dependencies and deliverables before starting.
Yes. We review the agreed mail flow, protection policies, forwarding behaviour and exceptions. The design accounts for legitimate third-party senders and business communication. Changes are tested before wider deployment, with ownership established for quarantine and support.
The required capabilities depend on your objectives and current subscriptions. Some email protection is available through existing mailbox services, while additional Defender capabilities require suitable licences. We review entitlements and distinguish improvements achievable now from those requiring additional products.
Where supported and licensed, we can design and implement these controls within the agreed scope. Work includes recipient coverage, policy interactions, user experience and operational handling. We validate the configuration alongside other protection policies rather than treating feature enablement as the whole deployment.
Protection changes can affect delivery and quarantine outcomes. We assess known sender dependencies, pilot the target configuration and review representative results. Any required exceptions are documented and kept proportionate, with support procedures for investigating unexpected message handling.
Yes. We can assess the agreed sending domains and authentication configuration, coordinating with DNS and messaging owners. The implementation plan identifies legitimate sending services and considers their alignment before changing enforcement. Third-party systems and domains outside the agreed scope require their owners’ involvement.
Yes. We review organisation and site settings, sharing defaults and relevant existing access. Changes are designed around site purpose and business requirements. Restricting future sharing is not treated as proof that every existing permission or link has been reviewed; remediation coverage is agreed explicitly.
No. Different settings support different communication and collaboration scenarios. We map guest membership, external communication, meeting requirements and connected file access separately. SharePoint and group permissions are included where they affect the Teams experience being secured.
We can assess agreed enterprise applications, consent grants and relevant permissions, including Microsoft Graph access. Findings identify application owners and integration dependencies. Permission reduction or removal follows approval and testing so necessary services are not disrupted without an understood impact.
We identify where collaboration requirements depend on classification or DLP controls. A full Microsoft Purview deployment is an explicit workstream rather than an assumed part of every tenant review. Its information scenarios, supported locations, licensing and business validation requirements are defined separately.
Not automatically. A review or implementation engagement includes the operational preparation agreed in its scope. Continuous monitoring and managed response need a separate service definition covering monitoring hours, escalation, response authority and responsibilities between your teams and any providers.
We agree acceptance criteria and test representative email and collaboration scenarios alongside configuration checks. The handover records results, exceptions and remaining actions. Operational owners receive the agreed support procedures so the outcome includes tested behaviour and maintainable controls.
TAKE THE NEXT STEP
Where does your Microsoft 365 protection need to improve?
Tell us about your tenant, collaboration requirements and current security concerns. Konsolute will help define the right assessment and implementation scope.