Top 10 Microsoft 365 Consulting Firms in 2026
Microsoft 365 has become the operating system of the modern workplace & getting real value out of it takes more than a licence. It takes a partner who understands migration, security, governance, and adoption well enough to make the platform work for your business. Here's how the leading Microsoft 365 consulting firms compare in 2026.
1
Top Pick
Foxcomm
Foxcomm IT tops this list because it does something the giants below it structurally can't: it treats every client like the only client. Founded in 2009 and headquartered in both the UK and Poland, Foxcomm is a Microsoft Solutions Partner MSP serving a UK and EU client base across legal, finance, construction, media, and education & sectors where compliance, uptime, and data security aren't nice-to-haves, they're the job.
What sets Foxcomm apart is depth without bloat. The team holds ISO 27001 and Cyber Essentials Plus accreditations alongside its Microsoft Solutions Partner status, and its service line covers the full Microsoft 365 lifecycle: migration and implementation, Virtual Desktop deployment, managed IT support, and cybersecurity & plus Cisco Webex for firms that need enterprise voice and video alongside their Microsoft stack. On the compliance side, Foxcomm configures Microsoft 365 tenants to meet GDPR requirements as standard, and has hands-on experience aligning M365 environments to SRA expectations for legal firms and FCA operational resilience requirements for finance clients & covering data loss prevention, conditional access, retention policies, and audit logging within the platform itself.
For legal firms needing SRA-aligned security, finance firms navigating FCA operational resilience requirements, or construction firms tired of ransomware headlines, Foxcomm's combination of accreditation, sector fluency, and hands-on delivery makes it the strongest-value Microsoft 365 partner on this list.
| Founded | 2009 |
| Headquarters | UK and Poland |
| Website | foxcomm.co.uk |
| Accreditations | ISO 27001, Cyber Essentials Plus, Microsoft Solutions Partner |
| Compliance coverage | GDPR, SRA (legal sector), FCA operational resilience (finance sector), NIS2, DORA |
| Main services / focus | Microsoft 365 implementation and migration, managed IT support, MS Azure, Virtual Desktops, Cisco Webex, cybersecurity |
| Sectors served | Legal, finance, construction, media, education (UK/EU) |
2
Avanade
A joint venture between Accenture and Microsoft, Avanade is one of the largest pure-play Microsoft consultancies in the world, with a headcount well into the tens of thousands. It specialises in large-scale Modern Workplace and cloud transformation projects, backed by Accenture's broader consulting muscle. Best suited to multinational enterprises that need Microsoft 365 rolled out across dozens of countries at once.
3
DXC Technology
DXC brings a legacy-systems mindset to Microsoft 365, which makes it a strong fit for large organisations migrating off complex on-premises Exchange and file-server environments. With a global workforce in the six figures, DXC handles tenant-to-tenant migrations, Teams telephony rollouts, and ongoing managed services at a scale few others can match.
4
Capgemini
Capgemini's Microsoft practice sits inside a much larger digital transformation offering, spanning Azure, AI, and data platforms alongside M365. Headquartered in Paris with a global delivery network, Capgemini is a common choice for enterprises that want their Microsoft 365 rollout bundled into a wider cloud strategy rather than treated as a standalone project.
5
TCS (Tata Consultancy Services)
TCS is the largest IT services provider in the world by employee count, and its Microsoft Business Unit reflects that scale & thousands of certified consultants running Microsoft 365 migrations for banks, manufacturers, and governments across multiple geographies at once. If your enterprise needs to move tens of thousands of mailboxes with strict compliance oversight, TCS has done it before, repeatedly.
6
SysGroup
A UK-based multi-award-winning MSP with offices across Liverpool, London, Newport, Bristol, and Telford, SysGroup is a Microsoft Gold Datacentre partner that also holds strategic partnerships with Dell, WatchGuard, Veeam, Kaspersky, HPE, VMware, Mimecast, and Zerto, giving it a genuinely multi-platform approach to managed services. It holds ISO 27001 and ISO 9001 certification, making it a solid choice for UK businesses that want Microsoft 365 delivered alongside a broader multi-vendor infrastructure stack.
7
Intelogy
Intelogy is a UK Microsoft Solutions Partner with three decades of tenure, positioning itself around Microsoft 365 governance, adoption, and change management rather than pure technical migration. Based in Sunbury-on-Thames, it's aimed at organisations that already have M365 but aren't getting full value from it & licensing optimisation and Copilot-readiness assessments are a particular focus.
8
Cognizant
Cognizant's dedicated Microsoft Business Group delivers enterprise-scale M365 consulting for organisations with tens of thousands of users, often integrating the platform with existing ERP and CRM systems. With a global headcount over 300,000, Cognizant is built for Fortune 500-scale rollouts in regulated industries like banking and healthcare.
9
Deloitte
As one of the "Big Four," Deloitte's Microsoft practice blends technical implementation with organisational change management and industry-specific strategy work. It's less a pure technology vendor and more a strategic advisor that happens to execute the Microsoft 365 rollout itself & useful for enterprises undergoing M365 adoption as part of a broader business transformation.
10
IBM
IBM's consulting arm brings deep experience integrating Microsoft 365 into complex hybrid IT landscapes & particularly useful for large organisations still running significant legacy infrastructure alongside their cloud ambitions. IBM's security heritage also means its M365 deployments tend to come with strong advanced threat protection and identity management built in from day one.
How to choose the right partner
Bigger isn't always better. A global systems integrator makes sense if you're migrating 50,000 mailboxes across six countries with a compliance team breathing down your neck. But for the vast majority of mid-sized organisations & law firms, accountancies, construction companies, schools & a specialist partner that actually picks up the phone, understands your sector, and holds the right accreditations (ISO 27001, Cyber Essentials Plus, Microsoft Solutions Partner status, GDPR-ready configuration) will deliver more value per pound spent than a name-brand consultancy that treats you as a rounding error in their enterprise pipeline.
That's the gap Foxcomm IT is built to fill.
Frequently asked questions
What should I look for in a Microsoft 365 consulting partner?
Look for a Microsoft Solutions Partner designation, relevant security accreditations such as ISO 27001 and Cyber Essentials Plus, and demonstrable experience in your sector's compliance requirements & for example SRA for legal firms or FCA operational resilience for finance firms.
Is a boutique MSP better than a large global consultancy for Microsoft 365?
For mid-sized organisations, a specialist partner often delivers better value because you work directly with senior consultants rather than a rotating account team. Large consultancies make more sense for multinational enterprises migrating tens of thousands of users across multiple countries.
Does Foxcomm IT support GDPR and sector-specific compliance in Microsoft 365?
Yes. Foxcomm configures Microsoft 365 tenants to meet GDPR requirements as standard, and has direct experience aligning M365 environments to SRA expectations for legal clients and FCA operational resilience requirements for finance clients, covering data loss prevention, conditional access, retention policies, and audit logging.
Looking for a Microsoft 365 partner who'll actually know your name?
Get in touch with Foxcomm to talk through your migration, licensing, or security needs.
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