Top Dynamics 365 Companies

Browse 74 vetted companies specializing in Dynamics 365. Expert Managed IT Services providers with proven Dynamics 365 expertise. Compare ratings, portfolios, and reviews to find the perfect partner.

Managed IT Services74 companies4.1 avg rating

74 companies found

#1Bloo Solutions

Bloo Solutions

5.0(0)US

Let us give you the peace of mind you deserve.

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000
#2Chetu Inc.

Chetu Inc.

4.6(0)US

World-Class Software Solutions

Managed IT ServicesSoftware DevelopmentIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2000
#3Telliant Systems, LLC

Telliant Systems, LLC

4.4(0)US

Your Trusted Software Development Experts

IT ConsultingManaged IT ServicesSoftware Development·<$25 · 1-9 emp. · From <$1000 · Est. 2010
#4Henceforth  Solutions

Henceforth Solutions

4.4(0)US

We Are Innovative. We Are Passionate. We Are Henceforth.

Managed IT ServicesSoftware DevelopmentAI & Machine Learning·<$25 · 1-9 emp. · From <$1000 · Est. 2017
#5Orange Crew

Orange Crew

4.4(0)US

Orange County Managed IT Service Provider

IT ConsultingCybersecurityManaged IT Services·<$25 · From <$1000 · Est. 2002
#6Resolute Technology Solutions

Resolute Technology Solutions

4.3(0)CA

Get an IT Partner that Can Take Care of Everything

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2005
#7True.org Cloud

True.org Cloud

4.2(0)US
CybersecurityManaged IT ServicesApplication Management·<$25 · 1-9 emp. · From <$1000
#8Betach Solutions

Betach Solutions

4.0(0)CA
IT ConsultingManaged IT ServicesManaged Cloud Services·<$25 · 1-9 emp. · From <$1000 · Est. 2003
#9Complete Technologies

Complete Technologies

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2011
#10ActiveCo Technology Management

ActiveCo Technology Management

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 1999
#11BrunNet Inc.

BrunNet Inc.

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 1995
#12WatServ

WatServ

4.0(0)US
CybersecurityManaged IT ServicesDisaster Recovery & Backup·<$25 · 1-9 emp. · From <$1000 · Est. 2006
#13ArcherPoint

ArcherPoint

4.0(0)US
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2002
#14Buchanan Technologies

Buchanan Technologies

4.0(0)US

An IT Partner Where Every Interaction Matters

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 1988
#15SIRKit Ltd.

SIRKit Ltd.

4.0(0)CA
IT ConsultingManaged IT ServicesDisaster Recovery & Backup·<$25 · 1-9 emp. · From <$1000 · Est. 2003
#16Arcos Technologies Inc.

Arcos Technologies Inc.

4.0(0)CA
Managed IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2010
#17BAASS Business Solutions

BAASS Business Solutions

4.0(0)CA
IT ConsultingManaged IT ServicesManaged Cloud Services·<$25 · 1-9 emp. · From <$1000 · Est. 1988
#18Datavail (Navantis Inc.)

Datavail (Navantis Inc.)

4.0(0)CA
CybersecurityManaged IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 1998
#19DANSLENUAGE.QUEBEC inc.

DANSLENUAGE.QUEBEC inc.

4.0(0)CA
CybersecurityManaged IT ServicesDisaster Recovery & Backup·<$25 · 1-9 emp. · From <$1000 · Est. 2015
#20Encore Business Solutions Inc.

Encore Business Solutions Inc.

4.0(0)CA
CybersecurityManaged IT ServicesManaged Cloud Services·<$25 · 1-9 emp. · From <$1000 · Est. 1990
#21Dynamics Pro Services 365 inc.

Dynamics Pro Services 365 inc.

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2018
#22Rolling Thunder

Rolling Thunder

4.0(0)CA
CybersecurityManaged IT ServicesManaged Cloud Services·<$25 · 1-9 emp. · From <$1000 · Est. 1990
#23Broadview Networks

Broadview Networks

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2002
#24Kwixand Solutions

Kwixand Solutions

4.0(0)CA
IT ConsultingManaged IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2019
#25TeckPath

TeckPath

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2012
#26Catapult

Catapult

4.0(0)CA
IT ConsultingManaged IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2012
#27Omni Logic Solutions

Omni Logic Solutions

4.0(0)CA
IT ConsultingSoftware DevelopmentIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2007
#28Diagramics

Diagramics

4.0(0)CA
CybersecurityManaged IT ServicesManaged Cloud Services·<$25 · 1-9 emp. · From <$1000 · Est. 2004
#29WebSan Solutions Inc.

WebSan Solutions Inc.

4.0(0)CA
IT ConsultingManaged IT ServicesManaged Cloud Services·<$25 · 1-9 emp. · From <$1000 · Est. 2000
#30SherWeb

SherWeb

4.0(0)US
CybersecurityManaged IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 1998
#31Pavliks

Pavliks

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 1969
#32Sabre Limited

Sabre Limited

4.0(0)US
IT ConsultingManaged IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 1998
#33Corporate Renaissance Group

Corporate Renaissance Group

4.0(0)CA
<$25 · 1-9 emp. · From <$1000 · Est. 1989
#34Pure IT

Pure IT

4.0(0)CA
IT ConsultingManaged IT ServicesDisaster Recovery & Backup·<$25 · 1-9 emp. · From <$1000 · Est. 2010
#35IT Cloud CA

IT Cloud CA

4.0(0)CA
CybersecurityManaged IT ServicesDisaster Recovery & Backup·<$25 · 1-9 emp. · From <$1000 · Est. 2005
#36Endeavour Solutions Inc.

Endeavour Solutions Inc.

4.0(0)CA
CybersecurityManaged IT ServicesManaged Cloud Services·<$25 · 1-9 emp. · From <$1000 · Est. 1997
#37Thinkmax

Thinkmax

4.0(0)CA
IT ConsultingManaged IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2009
#38Prophet Business Group

Prophet Business Group

4.0(0)CA
Managed IT ServicesDisaster Recovery & BackupIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2012
#39Pathway Communications

Pathway Communications

4.0(0)CA
Managed IT ServicesDisaster Recovery & BackupIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 1995
#40ESW IT Business Advisors

ESW IT Business Advisors

4.0(0)CA
CybersecurityManaged IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 1998
#41AxSource Corp.

AxSource Corp.

4.0(0)US
IT ConsultingIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2007
#42Clear Concepts Inc.

Clear Concepts Inc.

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2001
#43Gestisoft

Gestisoft

4.0(0)CA
Managed IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 1997
#44Square On Technology

Square On Technology

4.0(0)US

At Square On, we tackle your IT problems head-on with a proactive and comprehensive approach

CybersecurityManaged IT ServicesDisaster Recovery & Backup·<$25 · 1-9 emp. · From <$1000 · Est. 2000
#45Compunet InfoTech

Compunet InfoTech

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 1989
#46FuseForward

FuseForward

4.0(0)CA
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 1998
#47Qixas Group

Qixas Group

4.0(0)US
IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 1998
#48SDLC Corp

SDLC Corp

No reviewsBatavia, Illinois, US+4

SDLC Corp is a global software development and consulting company delivering ERP, AI, cloud, Odoo, Salesforce, gaming, and digital solutions for startups, businesses, and enterprises.

Software DevelopmentAI & Machine LearningCustom Software Development·$25-49 · 200-999 emp. · Est. 2015
#49BroadMAX Networks

BroadMAX Networks

No reviewsUS

Managed Service Provider in Miami Doral

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2007
#50MoogleLabs

MoogleLabs

No reviewsUS

Decoding Innovation in AI/ML, Blockchain, DevOps, Data Science & Metaverse

IT ConsultingManaged IT ServicesTechnology Advisory·<$25 · 1-9 emp. · From <$1000 · Est. 2020
#51NeoITO

NeoITO

No reviewsUS

Transforming Vision to Reality

IT ConsultingSoftware DevelopmentTechnology Advisory·<$25 · 1-9 emp. · From <$1000 · Est. 2015
#52prototype:IT

prototype:IT

No reviewsUS

Get Comprehensive Managed IT in Lewisville That Meets All Your Needs

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2005
#53
S

SKYNET Assist

No reviewsUS
Managed IT ServicesSoftware DevelopmentIT Staff Augmentation·<$25 · 1-9 emp. · From <$1000 · Est. 2020
#54Servicad Inc.

Servicad Inc.

No reviewsCA

Trustworthy IT Services Empowering SMBs Since 1999

CybersecurityManaged IT ServicesTechnology Advisory·1-9 emp. · From <$1000 · Est. 1999
#55Mobilunity

Mobilunity

No reviews

Global Tech Talent At Your Fingertips

CybersecuritySoftware DevelopmentTechnology Advisory·1-9 emp. · From <$1000 · Est. 2010
#56Suffescom Solutions Inc

Suffescom Solutions Inc

No reviewsUS

We Build Apps That Deliver. Not Just Promises.

Software DevelopmentTechnology AdvisoryAI & Machine Learning·1-9 emp. · From <$1000 · Est. 2013
#57DGK Business Consultancy

DGK Business Consultancy

No reviewsUS
CybersecurityManaged IT ServicesSoftware Development·1-9 emp. · From <$1000 · Est. 2024
#58Intelegain Technologies

Intelegain Technologies

No reviewsMumbai, Maharashtra, IN+5

Mobile Application Development Company in USA

IT ConsultingManaged IT ServicesSoftware Development·<$25 · 1-9 emp. · From <$1000 · Est. 2004
#59CodeStore Technologies Pvt. Ltd.

CodeStore Technologies Pvt. Ltd.

No reviewsUS

Design Innovate Create

IT ConsultingSoftware DevelopmentAI & Machine Learning·<$25 · 1-9 emp. · From <$1000 · Est. 2017
#60Cloud9 LTD

Cloud9 LTD

No reviewsCA

IT support and services in Ontario

Managed IT ServicesIT Support & HelpdeskManaged Cloud Services·From <$1000 · Est. 2009
#61TrueCore Technology

TrueCore Technology

No reviewsUS

Cyber Security and Disaster Recovery Specialists

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2016
#62SemiDot Infotech

SemiDot Infotech

No reviewsUS

Right Technology Partner for Next Generation IT Solutions

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2011
#63GCS Technologies

GCS Technologies

No reviewsUS

Complete IT Managed Services

CybersecurityManaged IT ServicesIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2000
#64Technology Mindz

Technology Mindz

No reviewsUS

We help you to get the most out of salesforce.

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2012
#65Technokraft Consultancy Services LLC

Technokraft Consultancy Services LLC

No reviewsUS

Best MSP Company | Top Digital Marketing Services | TechnokraftServe

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2017
#66Evince Development

Evince Development

No reviewsUS

Delivering Growth by Digital Transformation

IT ConsultingSoftware DevelopmentTechnology Advisory·<$25 · 1-9 emp. · From <$1000 · Est. 2012
#67Star Knowledge

Star Knowledge

No reviewsUS

𝐄𝐦𝐩𝐨𝐰𝐞𝐫𝐢𝐧𝐠 𝐁𝐮𝐬𝐢𝐧𝐞𝐬𝐬𝐞𝐬 𝐰𝐢𝐭𝐡 𝟏𝟓+ 𝐘𝐞𝐚𝐫𝐬 𝐨𝐟 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞

Technology AdvisoryAI & Machine LearningIT Support & Helpdesk·1-9 emp. · From <$1000 · Est. 2011
#68Vaden Consultancy

Vaden Consultancy

No reviews

AI-Enabled Custom Software Development Company

Software DevelopmentTechnology AdvisoryAI & Machine Learning·1-9 emp. · From <$1000 · Est. 2025
#69CMIT Solutions of Tempe and North Chandler

CMIT Solutions of Tempe and North Chandler

No reviewsUS

IT Services Provider

CybersecurityManaged IT ServicesTechnology Advisory·1-9 emp. · From <$1000 · Est. 2020
#70Agicent Technology

Agicent Technology

No reviewsUS

Empowering Innovation Through Exceptional App Development

Managed IT ServicesSoftware DevelopmentIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2011
#71Century Solutions Group Inc.

Century Solutions Group Inc.

No reviewsUS

Best IT Managed Service Provider in Atlanta

CybersecurityManaged IT ServicesSoftware Development·1-9 emp. · From <$1000 · Est. 1996
#72Manawa

Manawa

No reviewsCA

Manawa - Toronto Managed IT Services

Managed IT ServicesDisaster Recovery & BackupIT Support & Helpdesk·<$25 · 1-9 emp. · From <$1000 · Est. 2008
#73Bloomteq

Bloomteq

No reviews

Where technology meets a whole - new level.

IT ConsultingSoftware DevelopmentBlockchain Development·<$25 · 1-9 emp. · From <$1000 · Est. 2024
#74PivIT Strategy

PivIT Strategy

No reviewsUS

Adapt to beat your competition Level up in a digital world

IT ConsultingCybersecurityManaged IT Services·<$25 · 1-9 emp. · From <$1000 · Est. 2021

Specialize in Dynamics 365?

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Quick Stats

Companies listed
74
Avg. rating
4.1
Min. project size
<$1000
Hourly rate
<$25

Dynamics 365 covers two distinct product families - CRM (Sales, Customer Service, Marketing) and ERP (Finance, Supply Chain, Business Central) - and most consultants specialize in one or the other. Getting a Dynamics 365 implementation right requires deep functional knowledge of your industry's workflows, not just technical configuration skill. A wrong implementation costs more to fix than to do correctly the first time.

Dynamics 365 Consulting - By the Numbers

  • Microsoft's Business Applications segment (Dynamics + Power Platform) generated $9.4 billion in revenue in FY2024
  • More than 250,000 organizations use Dynamics 365 products worldwide
  • A typical Dynamics 365 ERP implementation (Finance or Supply Chain) runs $80,000 to $500,000 or more depending on customization and data migration
  • Dynamics 365 CRM implementations (Sales, Customer Service) typically cost $30,000 to $200,000
  • Industry rule of thumb: implementation cost is often 2x to 5x the first year's license cost
  • 142 companies in this directory specialize in Dynamics 365

What Dynamics 365 Consultants Do

CRM Implementation (Sales, Customer Service, Marketing)

Dynamics 365 Sales replaces or augments spreadsheet-based pipelines and point CRM tools. Consultants configure lead/opportunity workflows, set up product catalogs, build dashboards, and integrate with Outlook and Teams. Customer Service adds case management and knowledge bases. Marketing (now called Customer Insights - Journeys) handles multi-channel campaign automation and lead scoring.

ERP Implementation (Finance, Supply Chain, Commerce)

Full ERP implementations cover chart of accounts setup, financial reporting, inventory management, procurement workflows, warehouse management, and manufacturing routing. These projects involve business process workshops before any configuration begins - consultants need to understand your current-state processes to design the future-state correctly.

Business Central Implementation

Dynamics 365 Business Central is the mid-market ERP product, the successor to Dynamics NAV. It covers accounting, inventory, sales orders, purchasing, and project management for companies that don't need the complexity of Finance & Operations. AL language development (the successor to C/SIDE) allows customization published as extensions rather than modifying base code.

Power Platform Integration

Dynamics 365 and the Power Platform share a data layer (Dataverse). Consultants build Power Apps portals for customer self-service, Power Automate flows for document approval and notification routing, and Power BI dashboards that surface Dynamics data to users who don't need a full license.

Migration from Legacy Systems

A significant portion of Dynamics 365 projects involve migrating from Salesforce, SAP Business One, Dynamics NAV, Dynamics GP, or Dynamics AX. Data migration - cleaning, mapping, and validating historical records - is often the most time-consuming part of these projects. Consultants use tools like Data Management Framework (DIXF) and third-party ETL tools for bulk imports.

ISV Solutions and Vertical Add-ons

Microsoft's AppSource marketplace hosts hundreds of industry-specific add-ons for Dynamics 365 - field service management, project accounting, healthcare compliance, retail-specific commerce features. Partners who specialize in a vertical often bundle a preferred ISV solution with their implementation services.

Dynamics 365 Consulting Costs and Pricing

  • Dynamics 365 Sales licenses: $65 to $105 per user/month (Sales Professional to Sales Enterprise)
  • Dynamics 365 Customer Service: $50 to $95 per user/month
  • Dynamics 365 Finance or Supply Chain Management: $180 to $300 per user/month
  • Business Central: $70 to $100 per user/month (Essentials to Premium)
  • CRM implementation (Sales or Customer Service): $30,000 to $200,000 depending on user count, customization, and integrations
  • ERP implementation (Finance, Supply Chain, or Business Central): $80,000 to $500,000+; enterprise Finance & Operations projects routinely exceed $1 million
  • Post-go-live support: $3,000 to $15,000 per month for managed services covering minor configuration changes, user training, and monthly updates
  • AL development for Business Central: $100 to $200 per hour for custom extension development

How to Choose a Dynamics 365 Partner

  1. Confirm Microsoft Solutions Partner for Business Applications designation. This replaced the Dynamics 365 Gold/Silver competency. It validates that the partner has certified staff and documented customer success with Dynamics products. Check the Microsoft Partner Center directory to verify - don't rely on a logo on their website alone.
  2. Ask about FastTrack eligibility. Microsoft FastTrack for Dynamics 365 provides free Microsoft-assigned technical resources for implementations over a certain license threshold. A good partner knows whether your project qualifies and factors this into the project plan.
  3. Verify industry experience, not just product experience. A Dynamics 365 Finance implementation for a discrete manufacturer is structurally different from one for a professional services firm. Ask for references from clients in your industry with similar complexity - not just "we've done 50 Dynamics projects."
  4. Check their approach to business process workshops. Partners who want to start configuring before thoroughly documenting your current processes typically produce systems that technically work but don't match how your team actually operates. Ask how many days they allocate to discovery and process mapping before any configuration begins.
  5. Reference check with similar-sized companies. An implementation partner experienced with 20-person companies may not have the project management infrastructure to handle a 500-user rollout. Ask specifically about the largest and most recent implementations they've completed.

Dynamics 365 - Frequently Asked Questions

Dynamics 365 vs Salesforce - which CRM should we choose?

Both are enterprise-grade CRM platforms with comparable features at the top tier. Dynamics 365 Sales tends to be the better choice if you are already in the Microsoft ecosystem - existing M365 licenses, Teams, Azure - because the integration is native and the licensing can be bundled. Salesforce has a larger third-party app ecosystem (AppExchange) and a larger pool of freelance administrators and consultants in most markets. Salesforce also tends to have a faster initial setup for pure CRM use cases. Dynamics becomes more compelling when you are also evaluating ERP, because the shared Dataverse layer and single-vendor relationship simplify data flow between CRM and ERP significantly.

Do we need custom development or will standard configuration be enough?

Most Dynamics 365 implementations handle 70-80% of requirements through configuration alone - custom fields, forms, workflows, business rules, and dashboards require no code. Custom development (Power Automate custom connectors, plugins written in C#, AL extensions for Business Central) becomes necessary when you need to integrate with systems that don't have pre-built connectors, enforce logic that the platform's built-in workflow engine can't handle, or build user interfaces beyond what the standard forms support. A good partner will clearly separate what is configuration versus what requires development, and price them differently - development is more expensive to build and more expensive to maintain through upgrades.

Can we migrate from Dynamics NAV or Dynamics GP to Dynamics 365?

Yes, and both are common migration paths. Dynamics NAV is the most direct predecessor to Business Central - Microsoft provides migration tooling and many Business Central partners came from the NAV world. The data model is similar enough that migrations are well understood, though customizations built on the old C/SIDE development environment need to be rebuilt as AL extensions. Dynamics GP migrations to Business Central or Finance are less straightforward because the data models differ significantly. Plan for a full data mapping exercise and expect that historical transaction data will likely be migrated as summarized balances rather than individual transaction records, which reduces scope but means you won't have line-item drill-down on pre-migration history.

What is the difference between Business Central and Dynamics 365 Finance?

Business Central is Microsoft's mid-market ERP, designed for companies with up to a few hundred users. It covers accounting, inventory, sales, purchasing, and basic manufacturing in an integrated product. Dynamics 365 Finance (formerly Finance & Operations) is the enterprise tier, built for multi-entity, multi-currency, multi-country organizations with complex consolidation requirements, advanced treasury management, and deep compliance needs for regulated industries. Finance & Operations also separates into distinct apps - Finance, Supply Chain Management, Commerce, and Project Operations - which can be licensed independently. The practical decision point: if you have multiple legal entities, need IFRS or multi-GAAP reporting, or have complex supply chain requirements, you are in Finance & Operations territory. If you are a single-entity company under 500 employees, Business Central is almost always the right starting point.

How long does a Dynamics 365 implementation typically take?

Business Central implementations for a straightforward manufacturing or distribution company typically run 3 to 6 months from kickoff to go-live. Dynamics 365 Sales (CRM only) implementations can be faster - 6 to 12 weeks for a standard configuration. Finance & Operations enterprise ERP projects are routinely 9 to 18 months, and complex multi-phase global rollouts take longer. The single biggest variable is data migration - how much historical data needs to move, how clean it is, and how many source systems are involved. A realistic partner will front-load discovery, build a detailed project plan before contracts are signed, and give you a go-live date range rather than a fixed date for anything complex.