The top Microsoft 365 consultants in the US for 2027 are EPC Group, Avanade, Quisitive, Planet Technologies and Perficient. EPC Group is the most specialized Microsoft-first firm for complex migrations and compliance, Avanade has the scale for global enterprises, and Planet Technologies is the leader for government and public sector tenants.
Many companies called their Microsoft partner this week. When Exchange Online began failing on November 12, 2026, Outlook, Teams, SharePoint and Copilot were disrupted worldwide, and IT leaders discovered how much of their business ran through a single tenant. The right consultant cannot prevent a Microsoft outage, but it can harden your tenant, set up continuity and backup, tune identity and security, and get real value from the licenses you already pay for.
Every firm below is a Microsoft Solutions Partner with a named Microsoft 365 or modern work practice and US delivery teams.
Microsoft 365 Consultants At A Glance
Company
Headquarters
Founded
Best For
Typical Buyer
EPC Group
Houston, TX
1997
Complex migrations and regulated tenants
Mid-market and enterprise
Avanade
Seattle, WA
2000
Global enterprises
Large enterprise
Quisitive
Irving, TX
2016
Microsoft-only partner for mid-size and enterprise
Mid-size and enterprise
Planet Technologies
Germantown, MD
1997
Federal, state, local and tribal government
Public sector and commercial
Perficient
St. Louis, MO
1997
Multi-platform digital programs
Mid-market and enterprise
Insight Enterprises
Chandler, AZ
1988
Licensing plus deployment
SMB to enterprise
CDW
Vernon Hills, IL
1984
Organizations already buying through CDW
SMB to enterprise
Coretek
Farmington Hills, MI
2005
Azure-plus-Microsoft 365 managed services
Mid-market and enterprise
Withum
Princeton, NJ
1974
Mid-market firms wanting advisory plus IT
Mid-market
Slalom
Seattle, WA
2001
Change management and adoption
Mid-market and enterprise
Best Microsoft 365 Consultants In The US In 2027
1. EPC Group — Microsoft-First Specialist Since The Exchange 2003 Era
EPC Group has worked exclusively in the Microsoft stack since 1997, from Exchange 2003 and SharePoint 2007 through today’s cross-tenant Microsoft 365 migrations. It is particularly strong on mergers, acquisitions and divestitures, where mailboxes, Teams, SharePoint and identities must move between tenants on a deadline.
Healthcare, financial services, higher education and defense clients use it for compliance-heavy work such as Purview, retention and governance. It is a specialist, not a generalist, which is the point.
2. Avanade — The Accenture And Microsoft Joint Venture
Avanade was created in 2000 as a joint venture between Accenture and Microsoft and holds every Microsoft solutions designation. It runs very large Microsoft 365, Copilot and security programs for global enterprises.
Its scale is the strength and the drawback: it is built for multi-country programs, and pricing follows Accenture rate cards. Mid-market buyers usually get more attention from smaller specialists.
3. Quisitive — Microsoft-Only Partner Across All Three Microsoft Clouds
Quisitive works only in the Microsoft ecosystem, across Azure, Microsoft 365 and Dynamics 365, and is now owned by private equity firm H.I.G. Capital. It absorbed Catapult Systems, one of the best-known Texas Microsoft partners, and has been named a Microsoft Partner of the Year several times.
Its managed services and AI operations work make it a good fit for companies that want help after the migration, not just during it.
Planet Technologies has won Microsoft’s Federal Partner of the Year award six times and its State and Local Partner of the Year six times. It handles GCC and GCC High tenants, Copilot rollouts and security for agencies that operate under strict compliance rules.
Commercial companies use it too, but its deepest expertise is in the government clouds where few partners have real experience.
5. Perficient — Microsoft Practice Inside A Multi-Platform Consultancy
Perficient is a large digital consultancy with a long-standing Microsoft practice covering Microsoft 365, intranets, Teams and modern workplace programs. It also works across Salesforce, Adobe and other platforms.
That makes it a good choice when your Microsoft 365 project connects to customer-facing digital work, such as an intranet that shares content with your website.
Insight is one of Microsoft’s largest licensing partners and also delivers migration, security and Copilot services. Many Microsoft 365 projects begin with an Enterprise Agreement renewal or license consolidation, and Insight can handle both the paperwork and the deployment.
Buyers who want to keep licensing and services with one vendor often shortlist it.
7. CDW — National Reseller With Microsoft 365 Services Teams
CDW is a national technology reseller with Microsoft 365 migration, security and managed services teams. For organizations that already buy hardware and licenses through CDW, adding services is straightforward.
It is broad rather than deep, so very complex tenant-to-tenant work may be better served by a specialist like EPC Group.
8. Coretek — Azure Expert MSP With Modern Work Depth
Coretek is an Azure Expert Managed Service Provider with a strong modern work practice and frequent Microsoft FastTrack involvement. It is often chosen by healthcare, manufacturing and public sector organizations that want Azure infrastructure and Microsoft 365 managed together.
Its managed services model suits organizations that do not want to staff Microsoft expertise in-house.
9. Withum — Accounting Firm With A Microsoft Solutions Practice
Withum is a national accounting and advisory firm with a Microsoft Solutions Partner practice covering modern work, Azure and business applications, plus Microsoft licensing advisory.
Mid-market companies, especially in financial services and professional services, like getting Microsoft 365 work from a firm that also understands their audit and compliance context.
10. Slalom — Consulting-Led Adoption And Change Management
Slalom is a management and technology consultancy with strong Microsoft partnerships. Its Microsoft 365 work leans toward adoption, change management and employee experience, which is where many Copilot rollouts stall.
Choose it when the technical setup is the easy part and getting people to work differently is the hard part.
How We Evaluated
We shortlisted US firms with a Microsoft Solutions Partner designation and a named Microsoft 365 or modern work practice, then compared them on migration track record, security and compliance depth, Copilot and AI work, managed services, industry focus and public sector capability. Information comes from company sites, Microsoft partner listings and recent news. Rankings are editorial. See our research and ranking method.
How To Choose A Microsoft 365 Consultant
What do you need: migration, security, Copilot or resilience?
Migration specialists, security and compliance experts and adoption consultants are different skill sets. Name the outcome first, then pick the firm that has done it most often.
Will they plan for Microsoft outages?
After this week, ask every candidate how they would keep your business communicating if Exchange Online is down for a day. Good answers include email continuity, independent backup and a fallback communication channel. See our guide on what to do when Microsoft 365 is down.
Do you need government cloud experience?
GCC and GCC High tenants have different features and rules. If you are a government agency or contractor, use a firm that has done it many times, such as Planet Technologies.
Who handles your licensing?
Some firms resell licenses; others only provide services. Decide whether you want one vendor for both or prefer to keep advice independent of sales.
What happens after go-live?
Ask about managed services and support. A tenant needs ongoing care, from security updates to Copilot governance.
Frequently Asked Questions
What does a Microsoft 365 consultant do?
A Microsoft 365 consultant plans and runs migrations, configures security and compliance, sets up Teams and SharePoint, rolls out Copilot, trains users and often provides ongoing managed services for your tenant.
How much do Microsoft 365 consultants charge?
US Microsoft partners typically charge between $100 and $250 an hour, or fixed project fees. Small migrations may cost a few thousand dollars, while enterprise tenant-to-tenant programs can run into the hundreds of thousands.
Can a consultant prevent Microsoft 365 outages?
No one outside Microsoft can prevent a Microsoft service outage. A consultant can reduce the impact by adding email continuity, independent backup, clear communication plans and tested fallback procedures.
What is the best Microsoft 365 consultant for government agencies?
Planet Technologies is the most decorated Microsoft public sector partner, with repeated Federal and State and Local Partner of the Year awards.
Conclusion
EPC Group is the specialist for complex and regulated tenants, Avanade has the scale for global programs, Quisitive and Coretek are strong Microsoft-focused partners for mid-size and enterprise companies, and Planet Technologies leads in government. Whoever you pick, put outage resilience on the agenda for the first meeting.
