How much does it cost to implement Microsoft 365? What does the price depend on?

How much does a Microsoft 365 implementation cost? What does the price depend on?

How much does a Microsoft 365 implementation cost for a business? This is one of the first questions that comes up before a business owner or the person responsible for IT decides to migrate. The challenge is that the phrase “Microsoft 365 implementation” can describe completely different projects.

In one company, the project may involve configuring a new tenant (Microsoft 365 environment), a domain, a dozen or so accounts and migrating email from a simple hosting provider. In another organisation, it may require migrating Exchange, several domains, large mailboxes and files from on-premises servers, redesigning permissions, deploying SharePoint, Teams and Microsoft Intune, and implementing security controls for users and administrators.

Problems can quickly appear when it turns out that the organisation has very large files. A mailbox may exceed 100 GB, while a server may contain several terabytes of graphics, videos, projects and other data, and everything starts to feel slower.

Both projects are called a Microsoft 365 implementation, but their workload and cost will be completely different. That is why a reliable estimate should start with the project scope.

Why there is no single price for a Microsoft 365 implementation

There is no single fair price for a Microsoft 365 implementation that can be quoted without first understanding the customer’s environment.

The number of users alone is not enough to prepare an accurate estimate.

Two companies may each employ 50 people, while the scope of their projects can differ several times over.

The first company has one domain, relatively small mailboxes and well-organised data. It wants to migrate email to Exchange Online, configure user accounts and implement basic security controls.

The second company also has 50 users, but it uses on-premises Exchange, several domains, PST archives, shared mailboxes, extensive delegations and a file server that has been running for many years. On top of that, its computers need to be enrolled in Microsoft Intune, Conditional Access must be implemented and SharePoint needs to be reorganised.

The number of employees is the same, but the project is not. The starting point also has a direct impact on the estimate.

A company may:

1. build its Microsoft 365 environment from scratch,
2. migrate from another solution,
3. already use Microsoft 365 and need to expand it,
4. have an existing environment that requires an audit and configuration remediation.
5. have an in-house IT person who has been a jack of all trades and done everything possible to keep the company running, but the accumulated technical debt is now so significant that remediation is considerably more expensive.

The last scenario often turns out to be more labour-intensive than deploying a new environment. The first step is to establish what has already been configured, which settings are correct, where the errors are and which changes can be safely made in a system that employees use every day.

Microsoft 365 licensing vs implementation cost

The licence cost and the implementation cost cover different parts of the project. A Microsoft 365 licence is a recurring subscription cost. Its scope depends on the selected plan and the needs of each user. The implementation, on the other hand, is a technical and organisational project and its cost is usually one-off.

It may include, among other things:

• analysis of the current environment,
• design of the Microsoft 365 architecture,
• tenant configuration,
• domain configuration,
• creation of users and groups,
• email migration,
• document migration,
• Teams and SharePoint configuration,
• OneDrive configuration,
• implementation of MFA and Conditional Access,
• configuration of administrator accounts,
• Microsoft Intune and device management,
• Microsoft Defender,
• security policies,
• email protection configuration,
• backup,
• testing,
• documentation,
• training,
• post-migration user support.

That is why, when comparing two offers for a “Microsoft 365 implementation”, you should compare the scope rather than just the price. An offer covering account creation and email migration is not the same project as an implementation that includes security architecture, device management, SharePoint, training and ongoing support.

The key factors affecting project cost

Project cost increases with the number of elements that need to be analysed, migrated, configured and tested.

W Security Masters before defining the scope, we first want to understand what the current environment looks like and what the desired end state should be.

Number of users and mailboxes

The number of employees is one of the basic parameters used for an estimate, but the analysis cannot end there.

You also need to review:

• the number of active mailboxes,
• shared mailboxes,
• aliases,
• distribution groups,
• technical mailboxes,
• service accounts,
• rooms and other resources,
• administrators,
• external users,
• mailbox and calendar delegations.

A company may have 40 employees but many more objects that need to be reviewed during the migration.

User roles also matter. An office-based employee may need a different configuration from someone who works mainly on mobile devices. Different requirements may also apply to the management board, finance, HR and administrators.

At Security Masters, we do not automatically assume that every employee should have exactly the same set of licences. Licence selection should reflect how each person works, what information they can access and which features they actually need.

That is why Microsoft 365 licensing advisory and licence selection can be one of the first stages of project preparation.

Email and file migration to Microsoft 365

Migration is one of the areas that can have the greatest impact on implementation cost. For email, the first step is to determine the source system.

Migrating mailboxes from a simple IMAP hosting service is very different from migrating from Exchange Server or a more complex Microsoft 365 environment.

The scope of work is influenced by, among other things:

• number of mailboxes,
• their size,
• archives,
• PST files,
• delegations,
• aliases,
• shared mailboxes,
• calendars,
• number of domains,
• applications using SMTP,
• DNS configuration,
• the required user cutover method.

The more dependencies there are, the more preparation is required before the migration itself.

The same applies to documents. A company may have a few dozen gigabytes of well-organised files or many terabytes of data stored on local servers for years. What is more, moving the entire old structure one-to-one is not always the best approach.

Before migration, you need to determine:

• which data is still in use,
• which data can be archived,
• which data is duplicated,
• who owns each set of data,
• which permissions should be retained,
• which data should go to SharePoint,
• which data should be stored in OneDrive.

If the current file server does not have a logical structure, part of the project may involve organising the data before migration. This increases the workload, but it also reduces the risk of carrying old problems into the new environment.

Business continuity is another important factor. The company should know when the cutover will take place, who will support users, what the contingency plan is and what to do if a problem occurs during migration.

The scope of a Microsoft 365 migration should therefore be based on the actual source environment, not solely on the number of employees.

Security configuration in Microsoft 365

Security can represent a significant part of the Microsoft 365 implementation budget. Simply enabling email and assigning licences does not mean that the environment has been properly secured.

During projects, we analyse, among other things:

• MFA,
• Conditional Access,
• administrator accounts and roles,
• Break Glass accounts,
• Microsoft Entra ID security controls,
• Exchange Online protection,
• device configuration,
• Microsoft Intune,
• Microsoft Defender,
• data access policies,
• external sharing,
• SharePoint and OneDrive configuration,
• information protection,
• backup,
• logs and the ability to monitor the environment later.

The scope does not have to be the same for every organisation. For many small and medium-sized businesses, Microsoft 365 Business Premium can provide a solid foundation. In our model, depending on requirements and risk level, the environment can be extended with Microsoft Entra ID Plan 2, phishing-resistant authentication using hardware security keys, or additional email protection.

In organisations with more demanding requirements, the scope can include additional security, information protection and compliance controls.

This has a direct impact on project cost.

A company that mainly needs email will have a different scope from an organisation that wants to centrally manage computers, control access to data from personal devices, implement more advanced Conditional Access policies and protect privileged accounts.

This does not mean that every available Microsoft 365 feature needs to be implemented from day one. At Security Masters, we prefer a phased implementation. We first determine which security controls are needed now. Additional elements can then be developed as the company’s needs evolve.

This helps control costs and avoids paying for features the organisation will not use.

Training and post-implementation support

A migration does not end when the administrator confirms that the mailboxes have been moved. For employees, that is often when the change really begins.

A new Outlook experience, sign-in changes, MFA, Teams, OneDrive, SharePoint, mobile phones, access to shared mailboxes and a new way of sharing documents all generate questions. If the project does not include post-launch support, those issues fall to the local IT team or the person who coordinated the migration.

That is why the budget should include:

• preparing users before the change,
• instructions,
• training,
• support on migration day,
• help during the first days after launch,
• documentation for administrators,
• knowledge transfer to the local IT team.

Training also affects security.

Employees should know how to use MFA, how to recognise phishing, how to share documents and where to report suspicious activity.

After the project is complete, another cost appears: ongoing maintenance and further development of Microsoft 365.

The environment changes as the business grows. New users and devices are added. Microsoft changes its functionality. New business needs and security requirements emerge, so it is important to decide in advance whether the environment will be managed by the internal IT team, an external partner or both teams together.

At Security Masters, we cover this area through services such as Microsoft 365 Concierge, where we support local IT teams and users and help develop the environment after the implementation project itself has been completed.

Example implementation scenarios

Rather than trying to create a single price list, it is easier to compare typical scenarios.

1. Simple launch of a new environment

The company has a dozen or so employees. It does not yet use Microsoft 365. It has one domain and a simple email service from a hosting provider. The amount of data is limited.

The project may include creating the environment, configuring the domain and users, migrating email, implementing basic security controls and preparing employees.

This is one of the simpler scenarios because the number of dependencies is limited.

2. Migration of a company with an established IT environment

The organisation has dozens or hundreds of users. It uses Exchange or several email systems. It has a file server, shared mailboxes, archives and a larger number of permissions.

The project also includes analysis of the source environment, data migration, SharePoint, OneDrive, Teams, device management and security.

In this case, the price depends mainly on the current state of the environment and the amount of data and dependencies.

3. Microsoft 365 is already in use but needs to be cleaned up

The company has been using Microsoft 365 for several years.

Some users use MFA, while others do not. Licences were purchased at different times. There are many administrators. Teams and SharePoint have grown without a single standard. There is no certainty that former employees’ accounts and old permissions have been properly removed.

In this case, the first step should be to establish the actual state of the environment.

Only then can a remediation plan be prepared.

Such a project can be more complex than creating a new tenant because the changes must be made in a system the company already relies on every day.

4. Implementation with an enhanced security level

The organisation processes sensitive data, faces demanding customer requirements, has a large remote workforce or wants to reduce the risk of account compromise.

The scope may include advanced Conditional Access, Entra ID Plan 2, protection of administrator accounts, Intune-managed devices, additional email protection, hardware security keys, data protection solutions, backup and preparation of the environment for future security monitoring.

Such an implementation will cost more than a simple email migration because it involves a much broader scope of configuration and testing.

These are, however, two different projects and should not be compared solely on price.

Implementation cost vs the cost of misconfiguration

The cheapest Microsoft 365 implementation offer does not always mean the lowest overall cost for the business. If some work is omitted, the costs often appear later.

For example, a poorly planned migration can lead to email issues and disruption for users.

• Poorly organised permissions can result in too many people having access to confidential data.
• Failing to properly secure administrator accounts increases the impact of an account compromise.
• The absence of a proper offboarding process can leave access in place for someone who has already left the company.
• A poorly designed SharePoint environment may need to be rebuilt after only a few months.
• The lack of a backup may only become a problem when the organisation needs to recover specific data.

The highest costs, however, often arise during a security incident. The company may then face costs related to log analysis, incident response, restoring control over accounts, configuration changes, data recovery, employee downtime and additional organisational and legal activities.

Based on our experience with audits and incident response, Microsoft 365 issues are often not limited to a single alert. After an account compromise, it is necessary to review sign-ins, mailbox rules, applications, tokens, permissions and access to data, among other things.

That is why implementation cost should also be considered in terms of the risks the project is intended to reduce. Savings achieved by omitting security controls, testing or documentation may prove illusory and create additional costs when the first outage or breach occurs.

How should a company prepare for a Microsoft 365 implementation estimate?

The better the information available before the project is prepared, the more accurately its scope can be defined.

For the first discussion, it is useful to prepare:

1. the number of employees and expected headcount growth,
2. a list of current Microsoft 365 licences, if the company already uses them,
3. the number of domains,
4. the number of mailboxes,
5. information about shared mailboxes, aliases and groups,
6. the current email system,
7. approximate mailbox and archive sizes,
8. information about file servers and other document storage locations,
9. the approximate amount of data to migrate,
10. the number of computers and mobile devices,
11. information about remote work and personal devices,
12. the current approach to securing accounts and email,
13. customer or regulatory security requirements,
14. information on whether Teams, SharePoint, OneDrive and Intune will be required,
15. the expected migration date,
16. the scope of training and post-launch support.

If Microsoft 365 is already in use, information about the current configuration is also required.

It is not always possible to assess it reliably during a single conversation. In more complex environments, an initial assessment or audit may be needed before an accurate remediation estimate can be prepared.

Only after collecting this information can you answer the question of how much a Microsoft 365 implementation will actually cost in a specific organisation. That is why it is so important to carry out an Audit/Risk Assessment of the organisation’s Microsoft 365 Environment. The law is also beginning to require this. The National Cybersecurity System and NIS2 explicitly indicate that an Audit/Assessment should be carried out at least once every 12 months. In the case of GDPR incidents, auditors also ask first when, rather than whether, an Audit/Assessment of the Microsoft 365 environment was carried out. A lack of such activities is treated as gross negligence, with the company bearing full responsibility for the historical absence of such actions.

Expert summary

The cost of implementing Microsoft 365 depends primarily on the scope of the project. The number of users alone is not enough to prepare a reliable estimate.

The current environment, email, amount of data, migration method, devices, security level, licences, training and the ongoing maintenance model for Microsoft 365 all need to be taken into account.

That is why, before comparing offers, you should check exactly what each one includes.

Two offers described as a “Microsoft 365 implementation for 50 users” may cover completely different scopes of work.

At Security Masters, we start by understanding the organisation’s needs and its current environment. On that basis, we can design the architecture, define the migration scope, select licences and determine which security controls should be implemented from the start.

If your company is planning a new project or a migration of its current environment, more information is available on our Microsoft 365 Implementation page.

If the main question is which plans to choose, how to optimise current licences or how to match them to user roles, a good starting point may be Microsoft 365 licensing advisory and licence selection.

A good Microsoft 365 estimate should not answer only the question “how much does it cost?”.

Above all, it should show what the company is paying for, what will be implemented and what state the environment should reach when the project is complete.

That is why I invite you to a free consultation with me. It is a 30-minute, no-obligation call during which I will provide at least three specific recommendations related to Microsoft 365. Simply send an email to: [email protected] with the subject “MS 365 Consultation”. I will reply personally - no bot and no AI.