Microsoft 365 consulting • 2026 guide
Top 10 Microsoft 365 Consulting Firms in 2026
A Microsoft 365 licence doesn't do much on its own. The difference between a messy rollout and a smooth one usually comes down to who's running it. Here's how the field stacks up, from one-office specialists to household names.
10firms ranked
UK & EUfocused review
2026edition
Boutique specialist or global giant? At a glance
Foxcomm IT
Boutique
Avanade
Global
DXC Technology
Global
Capgemini
Global
TCS
Global giant
SysGroup
UK MSP
Intelogy
UK specialist
Cognizant
Global
Deloitte
Big four
IBM
Global
RANK 1
Foxcomm IT
Foxcomm has been doing this since 2009, out of offices in the UK and Poland, and the client list leans heavily legal, finance, construction, media and education — the kind of sectors where "we'll get to it next week" isn't really an option.
ISO 27001
Cyber Essentials Plus
Microsoft Solutions Partner
GDPR-ready
M365 migration
Virtual Desktops
Managed support
Cybersecurity
Cisco Webex
Compliance
GDPR configuration is standard practice, not an add-on, and there's real experience getting tenants aligned to SRA expectations for legal clients and FCA operational resilience rules for finance clients — conditional access, retention policies, DLP, audit logging, the stuff that actually gets checked in an audit.
None of that makes Foxcomm the right fit for a 40,000-seat multinational rollout — that's a job for the firms further down this list. But for most UK and EU businesses that want a partner who picks up the phone and knows their setup without a ticket number, it's hard to beat.
| Founded | 2009 |
| Headquarters | UK and Poland |
| Website | foxcomm.co.uk |
| Accreditations | ISO 27001, Cyber Essentials Plus, Microsoft Solutions Partner |
| Compliance coverage | GDPR, NIS2, DORA, SRA (legal sector), FCA operational resilience (finance sector) |
| Sectors served | Legal, finance, construction, media, education (UK/EU) |
RANK 2
Avanade
The Accenture-Microsoft joint venture, and it shows — tens of thousands of staff, most working on Modern Workplace and cloud transformation projects for organisations big enough to need a rollout coordinated across dozens of countries at once.
RANK 3
DXC Technology
Its background is legacy systems, and it plays to that: unwinding decades-old on-prem Exchange environments and file servers is where it earns its keep. Global headcount in the hundreds of thousands means tenant-to-tenant migrations at a scale most competitors can't staff.
RANK 4
Capgemini
Rarely sells Microsoft 365 as a standalone project — it's usually one piece of a bigger Azure, AI and data platform engagement. Paris-headquartered with delivery centres worldwide, it suits enterprises that want the whole cloud strategy handled by one firm.
RANK 5
TCS (Tata Consultancy Services)
The largest IT services company in the world by employee count, and its Microsoft practice runs at that same scale — migrating tens of thousands of mailboxes for banks and governments isn't unusual, it's Tuesday.
RANK 6
SysGroup
A UK MSP with offices in Liverpool, London, Newport, Bristol and Telford, and a Microsoft Gold Datacentre partner on top. Partnerships with Dell, WatchGuard, Veeam, Kaspersky, HPE, VMware, Mimecast and Zerto make it a broad infrastructure MSP that does M365 well. ISO 27001 and ISO 9001 certified.
RANK 7
Intelogy
Thirty years in, based out of Sunbury-on-Thames, and focused less on migration itself and more on what happens after — governance, adoption, getting a licensing spend under control. Copilot-readiness reviews are a specific focus.
RANK 8
Cognizant
Its Microsoft Business Group is built for the Fortune 500 end of the market — regulated industries, tens of thousands of users, deep integration with existing ERP and CRM. Global headcount over 300,000, so scale was never going to be the issue.
RANK 9
Deloitte
One of the Big Four, and it treats Microsoft 365 more like a strategy consultancy would — the technical rollout comes bundled with change management and industry-specific advice. Makes sense if M365 adoption is really a symptom of a bigger transformation.
RANK 10
IBM
Its strength is stitching Microsoft 365 into complex, often ageing hybrid IT environments where a clean cloud-only rollout isn't realistic. Its security background tends to show up in deployments too — threat protection and identity management built in from day one.
How to actually choose
A global systems integrator makes sense if you're moving 50,000 mailboxes across six countries with a compliance team watching closely. Most businesses aren't doing that. For a mid-sized law firm, accountancy, construction company or school, a smaller partner who answers the phone and already understands your sector's compliance requirements — ISO 27001, Cyber Essentials Plus, proper Microsoft Solutions Partner status, GDPR-ready configuration — will usually get you further than a big name treating you as a rounding error in their pipeline.
Frequently asked questions
What should I look for in a Microsoft 365 consulting partner?
A genuine Microsoft Solutions Partner designation, relevant security accreditation (ISO 27001, Cyber Essentials Plus), and evidence they've dealt with your sector's specific compliance requirements before — SRA for legal, FCA operational resilience for finance, and so on.
Is a smaller MSP better than a large global consultancy for Microsoft 365?
Depends on size. Mid-sized organisations often get more from a specialist partner, simply because you're dealing with senior people directly rather than a rotating account team. Large consultancies make more sense once you're coordinating a rollout across multiple countries and tens of thousands of users.
Does Foxcomm IT handle GDPR and sector-specific compliance in Microsoft 365?
Yes — GDPR-aligned tenant configuration is standard, and there's direct experience meeting SRA expectations for legal clients and FCA operational resilience requirements for finance clients, covering data loss prevention, conditional access, retention policies and audit logging.
Want a Microsoft 365 partner who knows your setup, not just your ticket number?
Get in touch and we'll talk through migration, licensing or security — whatever's actually on your plate.
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