Microsoft 365 Tenant Configuration and Endpoint Security

ABOUT THE CLIENT

The client is an organization using Microsoft 365 for staff email and workplace devices. Its environment included user accounts, departmental mailboxes and a mix of company-owned and personal devices. Vionsys was engaged to review mailbox configuration and access, then extend support to Windows device management and Apple device management.

OVERVIEW

What began as a mailbox conversion request became a broader tenant remediation project. Discovery showed that all 51 existing mailboxes were already shared, paid subscriptions had lapsed, and most shared mailboxes lacked delegated access. Vionsys revised the implementation plan around the actual environment and delivered licensed user mailboxes, permission changes, licence recovery and verified mail flow.

The next phase introduced centrally managed Windows laptops, encryption and security policies, automated provisioning configuration for spare laptops, and the certificate required for Apple device management. Both pilot laptops passed all configured security checks. All agreed project deliverables are complete, and Vionsys continues to provide ongoing support. Zero incidents have been reported throughout Vionsys’s work on the project.

CHALLENGES

·       Mailbox configuration did not match the original brief: all 51 mailboxes were shared, while 49 lacked delegated access and staff were sharing mailbox passwords.

·       Lapsed subscriptions and unnecessary licence assignments constrained the planned mailbox changes. Security Defaults were enabled, but only 9 of 55 users had registered for MFA at discovery.

·       The tenant lacked an emergency administrator account. An address alias conflict and an unlicensed conversion also posed risks to mail routing and mailbox retention.

·       None of the 74 linked devices were centrally managed before the device phase. Encryption, recovery-key storage and meaningful compliance verification needed to be established.

·       Apple enrollment was blocked by a missing approval certificate and an unsuitable Apple account. Windows policy synchronization and Secure Boot settings also required follow-up.

SOLUTION

Tenant assessment and controlled implementation

Vionsys reconciled mailbox, identity, subscription and access records before changing the environment. Work proceeded in approved batches with before-and-after evidence, verification checks and documented rollback paths. Administrator safeguards and licence checks prevented unsafe conversions.

Mailbox restructuring and delegated access

The agreed list of 30 mailbox deliverables was completed through 29 mailbox conversions and one new mailbox. Vionsys assigned the required licences, applied 37 delegate grants and cleared obsolete assignments. An SMTP alias conflict was resolved following client instruction, and forwarding settings were reviewed across 68 mailboxes. Approved support forwarding retained a copy in the original mailbox.

Licence recovery and administrator resilience

Twelve Business Premium licences were recovered from shared mailboxes and confirmed leavers. Four redundant paid subscriptions covering six seats were identified for a client billing decision. Vionsys also created an emergency administrator account and addressed the agreed identity and access requirements.

Windows security and device management

Two laptops were enrolled in a controlled pilot. Policies required disk encryption, a six-digit PIN and automatic screen locking after 15 minutes, with Office application deployment configured. Vionsys verified encryption and organizational storage of recovery keys, then guided users through safe Secure Boot enablement. Both laptops passed every configured security check.

Automated provisioning and Apple device management

Vionsys configured automated setup for five spare Windows laptops, including security policies, device naming, applications and standard-user access. The Windows Autopilot pre-provisioning workflow included a device group, deployment profile and Enrollment Status Page settings. Vionsys resolved hardware registration and preparation issues, registered and validated three laptops, and completed the technician phase through successful Intune enrollment and Reseal for all three. End-user setup guidance and a device assignment plan supported handover. For Apple management, Vionsys completed the enrollment certificate, iPad security policies and agreed enrollment activities. All agreed project deliverables are complete.

Documentation and support

The mailbox phase produced 18 reusable PowerShell scripts with Preview, Apply, Verify and Rollback modes, plus 13 documents. Change records linked authorization, evidence and recovery procedures. Vionsys continues to provide Microsoft 365 and Intune support through Microsoft Teams and screen-share sessions, including deployment status reviews, user setup coordination, policy diagnostics and configuration assistance. All agreed implementation activities are complete, with zero incidents reported throughout the engagement.

IMPACT

·       Individual sign-in and delegated mailbox access provided a structured alternative to shared-password use for the remediated scope.

·       Recovered licences enabled further mailbox work using available entitlements, while redundant subscriptions were surfaced for billing review.

·       The two pilot laptops gained verified encryption, PIN, screen-lock and Secure Boot controls, while repeatable provisioning configuration supported the completed device rollout.

·       Recorded approvals, evidence and rollback procedures made the implemented tenant changes traceable and reusable.

TECHNOLOGY STACK

·       Microsoft 365 and Microsoft 365 Business Premium licensing

·       Exchange Online mailbox management, delegation, SMTP aliases and forwarding

·       Microsoft Entra ID identity administration and emergency administrator access

·       Microsoft Intune device enrollment, configuration and compliance policies

·       Windows Autopilot pre-provisioning, deployment profiles, hardware registration and Reseal

·       Windows BitLocker, Secure Boot and PIN policies

·       PowerShell automation and Company Portal device enrollment

·       Apple enrollment certificate and iPad security policies

·       Microsoft Teams for remote troubleshooting and client coordination

RESULTS

CONCLUSION

Vionsys helped the organization establish a more structured Microsoft 365 environment through mailbox remediation, licence recovery, access controls and verified security for two pilot laptops. The work also created a repeatable foundation for additional Windows devices and completed the agreed Windows rollout and Apple enrollment activities.

All agreed project deliverables are complete. Vionsys is currently providing ongoing support for the client’s Microsoft 365 environment, helping users and maintaining the implemented configuration. Zero incidents have been reported throughout Vionsys’s work on this project.

Need help configuring Microsoft 365 and securing workplace devices? Connect with Vionsys IT Solutions to discuss tenant assessment, mailbox administration and endpoint management.