Full-stack M365 management from On-Site Technology: deployment, licensing, security configuration, and day-to-day support for businesses with 10 to 500 users. One predictable monthly fee, zero guesswork.
Managed Microsoft 365 services give businesses a fully administered M365 environment covering Exchange Online email, Microsoft Teams collaboration, SharePoint Online, OneDrive for Business, and the complete Microsoft security stack: Entra ID (Azure AD), Microsoft Intune, Microsoft Defender for Endpoint, Microsoft Defender for Office 365, Microsoft Sentinel, and Microsoft Purview compliance. On-Site Technology (OST) handles M365 licensing, Exchange migration, Conditional Access policies, Data Loss Prevention (DLP), sensitivity labels, and ongoing optimization for organizations with 10 to 500 users across Northern NJ, New York, Pennsylvania, and South Florida.
Every M365 subscription managed by OST includes the full set of productivity and collaboration tools your team relies on daily. We handle the licensing, deployment, and configuration so your staff can focus on actual work.
50 GB to 100 GB mailboxes depending on plan, with built-in anti-spam, anti-malware, and archiving. OST configures your SPF, DKIM, and DMARC records so deliverability stays high and spoofing stays out.
Word, Excel, PowerPoint, Outlook, and OneNote across desktop, web, and mobile. Real-time co-authoring means two people can edit the same spreadsheet without emailing versions back and forth.
Chat, video meetings, screen sharing, and Teams Phone for VoIP calling. We build out your channels, configure meeting policies, and integrate Teams with line-of-business apps where it makes sense.
1 TB of cloud file storage per user with version history, offline sync, and granular sharing controls. Files are backed up automatically, and Known Folder Move keeps Desktops and Documents protected without users lifting a finger.
Intranet sites, document libraries, and workflow automation through Power Automate. OST designs your SharePoint architecture so permissions actually make sense and files don’t end up scattered across 47 team sites nobody remembers creating.
Task management, project tracking, and appointment scheduling built right into Microsoft 365. Smaller teams use these instead of paying for standalone project management tools. We set up templates so your team hits the ground running.
Productivity tools are only half the M365 story. The other half is the security and compliance stack most businesses never configure properly. OST deploys, tunes, and monitors every layer as part of our broader managed cybersecurity services.
Single sign-on (SSO) across all your cloud apps, enforced multi-factor authentication (MFA), and Conditional Access policies that block logins from risky locations or unmanaged devices. The foundation of Zero Trust in M365.
Defender for Endpoint, Defender for Office 365 (safe links, safe attachments), and Defender for Identity working together. We tune the alert policies so your team gets actionable notifications, not 400 false positives a week.
Device enrollment, configuration profiles, compliance policies, and app deployment for Windows, macOS, iOS, and Android. Autopilot provisioning means a new hire’s laptop arrives ready to work out of the box.
Cloud-native SIEM that ingests logs from Entra ID, Defender, Office 365, and your on-prem infrastructure. OST writes custom detection rules, manages incidents, and correlates alerts with MITRE ATT&CK techniques.
Policies that scan email, Teams chats, SharePoint files, and OneDrive for sensitive data like SSNs, credit card numbers, and PHI. When someone tries to share patient records externally, DLP stops it before it leaves.
Retention labels, sensitivity labels, audit log retention up to 10 years (E5), and eDiscovery search for legal holds. We map your controls to HIPAA, CMMC, and PCI DSS 4.0 frameworks.
The short answer: Office 365 gave you email and apps. Microsoft 365 adds the security, device management, and compliance tools that modern businesses actually need.
Microsoft retired the “Office 365” brand for commercial plans in April 2020. The apps didn’t disappear. Word, Excel, PowerPoint, and Outlook are all still there. What changed is the packaging. Microsoft 365 Business Premium and E3/E5 plans now bundle Intune device management, Entra ID P1/P2 for Conditional Access, Defender for Endpoint, and the Purview compliance suite alongside the familiar productivity tools.
For businesses still running legacy Office 365 plans, or worse, on-premises Exchange, the gap widens every quarter. Cyber insurance carriers now routinely require MFA enforcement and endpoint detection. CMMC 2.0 demands audit logging and access controls that only exist in the M365 security stack. HIPAA-covered entities need DLP and retention policies. Sticking with a basic email plan means bolting on third-party tools to fill every one of those gaps.
On-Site Technology has migrated hundreds of mailboxes from legacy Exchange and Office 365 environments to fully secured Microsoft 365 tenants as part of our managed IT services. We handle the DNS cutover, data migration, Conditional Access setup, and user training in a single coordinated project, typically completed over a weekend with zero downtime for your team.
Microsoft Copilot uses your organization’s data in Microsoft Graph to draft emails, summarize meetings, analyze spreadsheets, and generate presentations. OST handles the prerequisites, rollout, and governance so AI adoption doesn’t become a data security risk.
Copilot respects existing access controls. If a user can see a file, Copilot can surface it. That makes overshared folders a real problem. OST runs a permissions audit and remediates oversharing before enabling Copilot.
Microsoft’s Security Copilot agents (released 2025) accelerate incident investigation inside Sentinel and Defender. Our engineers use it to triage alerts, correlate IOCs, and reduce mean-time-to-respond.
Every response is grounded in your company’s own data, not the public internet.
OST recommends the right plan based on your security requirements, compliance obligations, and budget. Most businesses with 10 to 500 users land on Business Premium or E3. For a full pricing picture, see our managed IT services cost calculator.
Web & Mobile Only
Desktop Apps + Webinars
Security + Device Management
Compliance + Unlimited Archive
Full Security + Analytics
Five phases, one team, no finger-pointing between vendors. Here is how a typical M365 engagement works from first call to ongoing optimization.
We audit your current environment: existing licenses, mail flow, DNS records, Secure Score, Conditional Access gaps, and compliance requirements. You get a written report with findings and a remediation plan.
Mailbox migration from on-prem Exchange, Google Workspace, or legacy O365. DNS cutover, Intune enrollment, and Autopilot configuration included. Most migrations run over a weekend. Your team logs in Monday morning and everything works.
Conditional Access policies, MFA enforcement, Defender configuration, DLP rules, sensitivity labels, and SharePoint permission cleanup. We follow Microsoft’s Secure Score recommendations plus our own hardening checklist built from 25 years of MSP work.
User onboarding and offboarding, license optimization, helpdesk support for M365 issues, policy updates, and monthly Secure Score reviews. When Microsoft pushes a change to Teams or Entra, we test it and communicate the impact before it hits your users.
Every quarter we review your license utilization, Secure Score trends, unused features, and new M365 capabilities that could benefit your team. No unused E5 licenses sitting idle. No new Microsoft features going unnoticed for a year.
Different industries need different M365 configurations. A manufacturer handling CUI for a DoD contract has different compliance requirements than a law firm managing privileged communications. OST tailors every deployment to your regulatory environment.
CMMC 2.0, ITAR, CUI handling with Purview sensitivity labels and Intune device controls on shop-floor terminals.
eDiscovery, legal holds, ethical walls with Information Barriers, and DLP for privileged attorney-client content.
HIPAA-compliant M365 with BAA, DLP scanning for PHI, encrypted email, and audit log retention for compliance reviews.
PCI DSS 4.0, SOX, and SEC recordkeeping with Communication Compliance, DLP, and 10-year audit retention on E5.
GCC/GCC High tenant deployment, CJIS and FERPA alignment, and Intune policies for shared devices in classrooms.
Accounting firms, consultancies, and engineering groups. Copilot adoption, SharePoint project sites, and Teams integrations with CRM and PSA tools.
Microsoft 365 is one piece of a bigger picture. Here’s how it connects to the rest of what OST does for your business.
Common questions about managed Microsoft 365 services, answered by our engineering team.
It covers everything from initial tenant setup and mailbox migration to ongoing security management, license optimization, and user support. OST handles Entra ID configuration, Conditional Access policies, Intune device enrollment, Defender tuning, DLP rules, and day-to-day helpdesk tickets for M365 issues. Think of it as having a dedicated M365 admin team on retainer for a flat monthly fee.
The M365 license itself ranges from roughly $6/user/month (Business Basic) to $57/user/month (E5). OST’s management fee is separate and depends on your user count, plan tier, and compliance requirements. For a quick estimate, use our managed IT services cost calculator. Most businesses with 25 to 200 users find the total cost significantly lower than hiring even one full-time M365 administrator.
Yes. We migrate email, contacts, calendars, and Drive files from Google Workspace to Exchange Online, OneDrive, and SharePoint. The migration runs in the background with no downtime, and we handle the DNS MX record cutover during a scheduled maintenance window. Most Google-to-M365 migrations for organizations under 200 users complete in a single weekend.
Business Premium caps at 300 users and includes Entra ID P1, Intune, and Defender for Business. E3 removes the user cap, upgrades to 100 GB mailboxes with unlimited archive, adds advanced eDiscovery, Information Barriers, and Windows 11 Enterprise licensing. If you have more than 300 users or need advanced compliance features like legal hold and audit log search, E3 is the right move.
Not necessarily. Sentinel is an Azure service billed by data ingestion, not by M365 license tier. However, E5 includes native connectors that send Defender, Entra ID, and Office 365 logs into Sentinel at no extra ingestion cost. On E3 or Business Premium, you can still use Sentinel but you will pay Azure ingestion fees for those same log sources. OST can model both scenarios and recommend the most cost-effective approach.
New hires get a license assigned, mailbox provisioned, security groups updated, Intune enrollment completed, and Autopilot profile applied. When someone leaves, we disable the account, convert the mailbox to shared (so the manager can access it), revoke device enrollment, trigger a remote wipe if needed, and transfer OneDrive files to a designated user. The whole process follows a documented checklist.
Conditional Access is a set of policies in Entra ID that control how and where users can sign in. You can require MFA for external networks, block sign-ins from countries you don’t operate in, force compliant devices for access to sensitive SharePoint sites, and more. Cyber insurance carriers increasingly require Conditional Access as a baseline control. OST builds and maintains these policies as part of every managed M365 engagement, alongside our broader managed cybersecurity services.
Microsoft offers a Business Associate Agreement (BAA) for M365, which is a prerequisite for HIPAA compliance. But signing the BAA alone doesn’t make you compliant. You still need DLP policies scanning for PHI, sensitivity labels on medical records, audit logging enabled, encryption in transit and at rest, and access controls that follow the minimum necessary standard. OST configures all of these and documents the controls for your compliance audits.
That is exactly what we recommend. Copilot surfaces any file a user has access to, which means overshared SharePoint sites and sloppy OneDrive permissions become a real liability. OST runs a permissions audit, remediates oversharing, configures sensitivity labels, and validates that your tenant meets Microsoft’s Copilot prerequisites before you spend a dollar on Copilot licenses.
Yes. OST provides managed Microsoft 365 services across Northern NJ, Southern NJ, New York, Pennsylvania, and South Florida (Broward, Miami-Dade, and Palm Beach counties). M365 management is largely remote, so geographic distance doesn’t affect service quality. For on-site work like network infrastructure or cabling, we dispatch local technicians in each region.
We monitor the Microsoft 365 Service Health Dashboard and Azure Status page continuously. When an outage hits, we notify affected clients within 15 minutes, provide workaround guidance where possible, and track the incident to resolution. As part of our backup and continuity services, we also maintain backup email routing and cached Exchange mode configurations so your team can keep working during extended outages.
For a business with 50 to 150 users migrating from on-premises Exchange or legacy Office 365, the typical timeline is 2 to 4 weeks. The first week covers assessment and planning. The second week is pilot migration (5 to 10 users). The third week is bulk migration, usually scheduled over a weekend. The fourth week handles cleanup, training, and security hardening. Smaller organizations often finish in under two weeks.
Whether you need a full migration, a security hardening project, or ongoing managed services, On-Site Technology has the M365 expertise to get it done. Serving businesses with 10 to 500 users across NJ, NY, PA, and FL.