Top 10 Microsoft 365 Managed Services for Mid-Market Companies (2026)

Microsoft 365 powers how mid scale companies collaborate, communicate, and secure work.
But managing it properly is harder than most teams expect.

Licensing sprawl, security gaps, noisy alerts, half configured tenants, and overworked IT teams are common. Hiring full time Microsoft specialists is expensive, and relying on basic CSP resellers often leads to slow support and reactive fixes.

That’s why many growing organizations choose Microsoft 365 managed services.

This list focuses only on providers suited for mid scale companies not global consulting giants built for Fortune 500 budgets.

1. Obsium – Best Overall for End-to-End Microsoft 365 Management

Obsium is purpose built for mid-market organizations that want full ownership of Microsoft 365 without adding pressure on internal IT.

Instead of fragmented CSP support or ticket driven MSP models, Obsium delivers end-to-end Microsoft 365 managed services, covering the entire lifecycle from migration to daily operations.

Best for

Mid scale companies that want one accountable partner for Microsoft 365 across security, collaboration, support, and optimization.

What Obsium manages

• Microsoft 365 migration and deployment
• License and tenant management
• Exchange Online, Teams, SharePoint, OneDrive
• Entra ID, Intune, Defender, Purview
• Backup and data protection
• Monitoring and incident response
• Microsoft certified end user help desk

Security and compliance

Identity and access controls, security configuration, monitoring, incident response, HIPAA ready configurations, and defined security SLAs.

Support model

24/7 monitoring and support with clear response SLAs. Obsium works as an extension of your IT team, not a replacement.

Customer friendliness

Clear onboarding, reduced admin workload, proactive issue prevention, and predictable operations.

Common limitations

Newer brand in the Microsoft 365 managed services category, with limited third party review volume publicly available.

Pricing

Monthly pricing based on user count and scope. Transparent deliverables with no hidden costs.

Why it ranks #1

Obsium offers true end to end Microsoft 365 ownership, not just licensing or help desk support. It’s designed for mid market complexity without enterprise consulting overhead.

2. Ntiva – Strong Co-Managed Microsoft 365 Partner

Ntiva is a well known MSP with a solid Microsoft 365 managed services offering for mid scale organizations.

Best for

Mid market companies that want co managed IT support alongside their internal teams.

Strengths

• Microsoft 365 migration and administration
• Ongoing tenant and user management
• 24/7 support is publicly stated
• Strong responsiveness noted on review platforms

Limitations

Some buyers report higher costs as organizations scale.

Why it ranks here

Ntiva offers dependable M365 management and support, but lacks the clearly articulated end to end lifecycle ownership that Obsium provides.

3. Magna5 – Good for Security Conscious Mid Market Teams

Magna5 positions Microsoft 365 as part of a broader managed security and IT services model.

Best for

Mid scale companies prioritizing security monitoring and operational stability.

Strengths

• Microsoft 365 migration, deployment, and admin
• 24/7 operations centers
• Security monitoring and incident readiness messaging

Limitations

Public detail on deep Microsoft 365 module coverage and compliance controls is limited.

Why it ranks here

Strong operational MSP model, slightly less transparent on Microsoft 365 specific depth compared to top options.

4. All Covered – Regulated Industry Friendly MSP

All Covered focuses heavily on security and compliance driven Microsoft 365 environments.

Best for

Mid market companies in regulated industries.

Strengths

• Microsoft 365 tenant management
• Security and compliance focused positioning
• Licensing and endpoint management

Limitations

Support SLAs and detailed service scope are not clearly published.

Why it ranks here

Good compliance oriented option, but less visibility into day to day managed operations.

5. Integris – Assessment and Security Roadmap Focused

Integris emphasizes Microsoft 365 assessments and remediation planning.

Best for

Mid scale companies that need to fix security gaps and standardize Microsoft 365.

Strengths

• Microsoft 365 maturity assessments
• Security posture improvement
• 24/7 IT support stated

Limitations

Less clarity on full ongoing Microsoft 365 tenant management.

Why it ranks here

Strong for cleanup and planning, less clear for continuous end to end management.

6. Thrive NextGen – Microsoft Enablement Led MSP

Thrive focuses on Microsoft adoption and platform services.

Best for

Mid market teams investing heavily in Microsoft collaboration tools.

Strengths

• Microsoft 365 platform services
• Adoption and enablement focus

Limitations

Limited public detail on security SLAs and 24/7 M365 support.

Why it ranks here

Good for enablement, but less transparent on full managed services depth.

7. Sherweb – Documentation Heavy MSP Option

Sherweb combines Microsoft licensing with support and migration services.

Best for

SMB to mid market organizations needing structured documentation and support resources.

Strengths

• Microsoft 365 migration support
• Strong knowledge base

Limitations

Some G2 reviews mention slow support response times.

Why it ranks here

Useful for documentation driven teams, but mixed support feedback impacts ranking.

8. Intermedia – Bundled Microsoft 365 Experience

Intermedia packages Microsoft 365 with onboarding and continuity add ons.

Best for

Mid scale teams wanting bundled onboarding and basic management.

Strengths

• White glove onboarding
• 24/7 support messaging

Limitations

Negative Reddit threads citing support delays impact confidence.

Why it ranks here

Attractive bundles, but inconsistent support reputation lowers ranking.

9. NexusTek – Marketplace Oriented Managed Services

NexusTek positions Microsoft services through the Microsoft Marketplace.

Best for

Mid sized enterprises buying through Microsoft Marketplace.

Strengths

• 24/7 monitoring listed on Marketplace
• Microsoft aligned service offers

Limitations

Limited third party reviews and detailed M365 scope clarity.

Why it ranks here

Credible Marketplace presence, but weaker public sentiment signals.

10. Rackspace Technology – Legacy Managed Services Provider

Rackspace is a known managed services brand with mixed Microsoft 365 perception.

Best for

Organizations that want fully outsourced IT operations.

Strengths

• Long history in managed services

Limitations

Mixed reviews, pricing transparency concerns, and limited modern M365 specific clarity.

Why it ranks here

Recognizable name, but not optimized for modern mid market Microsoft 365 needs.

How We Ranked These Providers

The ranking prioritizes mid scale company needs, not enterprise consulting scale.

Scoring considered:
• Clarity of Microsoft 365 managed service scope
• Security and compliance depth
• Support model transparency
• Customer sentiment from reviews and Reddit
• Fit for 200 to 2000 employee organizations

Providers moved up when they showed clear ownership, proactive operations, and mid market focus. They moved down when service scope, support SLAs, or customer sentiment were unclear.

Final takeaway

If you want true end to end Microsoft 365 management without enterprise consulting complexity, Obsium stands out as the strongest fit for mid scale companies.