Microsoft Dynamics 365 vs a Custom CRM

Where Dynamics 365 earns its place

For a company that already runs on Microsoft, Dynamics 365 has advantages a custom CRM cannot easily copy. Users sign in with the same Entra ID account they use for Outlook and Teams, and IT applies the same conditional access and device policies. Records sit in Dataverse with security roles and business units, Power BI reports read them directly, and Power Automate handles routine approvals. Dynamics 365 Sales, Customer Service and Field Service share that foundation, and Business Central or Finance and Operations sit close by on the ERP side.

Tepia tells Microsoft centered companies to stay on Dynamics when their sales and service teams work in Outlook all day, their IT group is comfortable administering the Power Platform, and the processes they need are close to what Dynamics models out of the box.

Where Dynamics projects get heavy

Dynamics is a platform, which means it can be shaped to almost anything. That flexibility is also where projects get heavy, and Tepia is often called in after a few years of customization have piled up.

• Layers of customization. C# plugins, JavaScript form scripts, Power Automate flows and solution layers each hold part of the business logic, and a change in one can surprise another.
• Release waves. Microsoft ships two major release waves each year, and every customization needs regression testing against them.
• Dense screens for occasional users. Model driven forms work for a sales operations analyst but overwhelm a technician or a dealer who needs three fields and a photo.
• People outside the tenant. Dealers, distributors and contractors who are not Microsoft users need portals, external identity and record level access, which adds another product to configure.

These are manageable, but they explain why some teams find a focused custom app simpler to own than another layer of configuration. Tepia also sees the reverse mistake: companies that rebuild something Dynamics already does well because nobody configured it properly. Part of Discovery is separating the two, so you only build what configuration genuinely cannot reach.

Four ways to build on or around Dynamics

Tepia lays out the options as a spectrum. Most clients use more than one.

Many organizations end up with a mix: configured Dynamics for the sales operations team, a few Power Apps for internal approvals, and one custom app for the people in the field. The third row is where Tepia does most of its Microsoft work, because it keeps Dynamics as the system of record while giving specific users an app built for their job.

Building custom apps on Dataverse

A custom app on Dataverse behaves like any modern application on the outside and like a Dynamics client on the inside. Tepia authenticates users through Entra ID with MSAL, reads and writes tables through the Dataverse Web API, and runs background work in Azure Functions with Service Bus queues so long operations do not block the user. Security roles in Dataverse still decide what each person can see.

Two examples show the pattern. An equipment manufacturer gives its dealer network a React Native app to register installed units and log warranty claims, which land in Dynamics as cases. A building products distributor gives outside sales reps an offline first visit app that writes activities and opportunities back to Dynamics 365 Sales when the rep regains signal. Our Microsoft Dynamics 365 integration and single sign on pages cover the technical side.

How Tepia approaches Dynamics 365 and custom CRM work

Tepia’s six phases apply to every engagement. In a Dynamics environment, each one has specific outputs.

1. Discovery: an inventory of your Dataverse tables, plugins, flows and solutions, interviews with office and frontline users, and a review of your Entra ID setup. The Investigation Summary recommends configure, extend or replace for each workflow, and User Stories describe moments like a dealer filing a claim from a job site.
2. Design: wireframes for the custom screens alongside a table ownership map that shows which records Dynamics keeps.
3. Development and Testing: an Alpha in a sandbox environment and a Beta in production with a pilot group, with test plans covering permissions, offline sync and behavior after a release wave update.
4. Training: remote and in person sessions for frontline users, plus handover notes for your Power Platform administrators.
5. Launch: app store or intranet release, data migration where needed and support reps during rollout.
6. Support: issue resolution, release wave checks and feature requests.

Typically Discovery runs 1 to 3 months, development and QA 2 to 6 months, and launch about a month. See our process.

When a fully custom CRM is the better call

Tepia recommends leaving Dynamics only in a few clear situations: a small team using a fraction of the platform, a business whose CRM is really part of a customer facing product, or a data model so specific that most effort goes into bending Dynamics around it. In those cases a custom CRM in .NET or Node.js on PostgreSQL, hosted in your Azure subscription, can stay inside the Microsoft identity world while giving you full control of the roadmap.

If you are weighing that move, read our custom CRM development page and see how we plan migrations in how to build a custom CRM. Then contact Tepia to walk through your current Dynamics environment.

Frequently asked questions