Every month, unused Microsoft 365 licences quietly drain your IT budget. They belong to employees who left six months ago, accounts that were set up and never activated, or users who were moved to a better-value tier but kept the old one as well. A Microsoft 365 licence audit is the fastest way to find out exactly how much your organisation is paying for software it is not using, and to put a stop to it.
What is a Microsoft 365 licence audit? It is a structured review of every licence assigned within your Microsoft 365 tenant, matched against actual usage data. The goal is to identify inactive accounts, over-provisioned users, and subscription tiers that no longer fit working patterns. Most organisations find they can reduce Microsoft 365 costs by 10 to 30 per cent once they run one properly.
This guide walks through how to carry out a Microsoft 365 licence audit using built-in Admin Centre tools, what to look for, and how to act on what you find, whether you manage 20 users or 2,000.
What is a Microsoft 365 Licence Audit?
A Microsoft 365 licence audit examines three things: who is assigned a licence, what they are actually using, and whether the licence tier matches their working patterns. It pulls data from the Microsoft 365 Admin Centre, usage reports, and sign-in logs to give IT administrators a clear picture of licence utilisation across the organisation.
For many businesses, this is the first time they have looked at licence assignment and usage side by side. The gap between what is assigned and what is being used is often significant, particularly in organisations that have grown quickly, gone through restructuring, or migrated to Microsoft 365 from a previous platform. Identifying M365 unused licences is not just about cutting costs. It is about ensuring your licence estate reflects how your organisation actually operates today.
Why Most Organisations Are Overpaying for Microsoft 365
Microsoft 365 subscriptions are billed per seat, per month. That means every licence assigned to an inactive account, an employee who has left, or a user over-provisioned to Business Premium when Basic would serve them just as well, adds directly to your monthly bill. The problem compounds quietly over time.
A business that started on 50 seats three years ago might now be carrying 70 licences, with 15 assigned to accounts that have not logged in for months. Add to that a handful of users on Business Premium who only use Teams and browser-based email, and the overspend can reach thousands of pounds per year before anyone notices. A Microsoft 365 licence audit surfaces these inefficiencies clearly, so IT leaders and finance teams can act on real data rather than assumptions about who needs what.
Not Sure Where to Start With Your Microsoft 365 Licence Audit?
Transputec is a certified Microsoft Solutions Partner. We carry out Microsoft 365 licence audits for UK businesses that want a clear view of what they are paying for, what is actually being used, and where the savings are.
Get a Strategic ConsultationHow to Find Unused Microsoft 365 Licences in the Admin Centre
The Microsoft 365 Admin Centre contains all the data you need to run a Microsoft 365 licence audit without any third-party tools. Here is how to check who is using Microsoft 365 in your organisation and identify accounts that are not pulling their weight.
Step 1: Review active users and licence assignments
Go to the Microsoft 365 Admin Centre at admin.microsoft.com, then navigate to Users and then Active Users. This view shows every user, their assigned licences, and their sign-in status. Filter by licence type to see how many users are assigned to each plan, and look for accounts marked as blocked or with no recent sign-in activity.
Step 2: Pull the Microsoft 365 Apps usage report
Go to Reports, then Usage, then Microsoft 365 Apps usage. This report shows which applications each user has opened in the last 30 days, broken down by desktop, web, and mobile. Users with zero activity across all apps are candidates for licence removal or downgrade. According to Microsoft’s activity reporting documentation, you can filter this data by time period and export it to a CSV for analysis.
Step 3: Check mailbox activity
In the Admin Centre, go to Reports, then Usage, then Email activity. This shows last send, receive, and read dates per mailbox. Mailboxes with no activity for 30 or more days are a strong signal that the account is inactive and the licence may not be needed.
Step 4: Review Teams activity
Go to Reports, then Usage, then Microsoft Teams user activity. This shows which users are actively participating in meetings, calls, and chats. For users assigned to Business Standard or Premium primarily for Teams access, this data confirms whether they are getting value from that tier.
Step 5: Cross-reference with HR data
Match the active users list against your current HR records. Former employees whose accounts have not been disabled, or users who changed roles and kept their old licence, are a common source of M365 unused licences. This cross-reference is one of the simplest and most effective steps in any Microsoft 365 licence cost reduction for small business exercise.
What to Look For During a Microsoft 365 Licence Audit
A thorough Microsoft 365 licence audit goes beyond simply counting licences. It looks at five categories of licence waste:
- Inactive accounts: Users who have not signed in for 30 or more days. These accounts should be reviewed immediately. If the user has left, the account should be disabled and the licence reclaimed.
- Over-provisioned users: Users assigned to Business Standard or Premium who only use features available in Business Basic, such as Teams, Exchange Online, and browser-based Office apps. Downgrading these users is often the single largest opportunity to reduce Microsoft 365 costs.
- Shared mailboxes with licences: Shared mailboxes in Microsoft 365 do not require a licence unless they need access to mailboxes larger than 50GB or Exchange Online Archiving. Many organisations assign full licences to shared mailboxes unnecessarily.
- Duplicate or redundant licences: Users who have been assigned multiple licences, such as a legacy plan alongside a current one, or add-on licences that are already included in their plan tier.
- Unlicensed features being purchased separately: Add-on licences for Microsoft Defender for Business, Microsoft Intune, or Azure Active Directory Premium P1, which are already included in Microsoft 365 Business Premium. If your users are on Business Premium, these add-ons are redundant.
Transputec’s Microsoft 365 services team carries out this analysis as part of a structured licence assessment, producing a clear breakdown of where the overspend sits and what the options are to address it.
Common Reasons M365 Unused Licences Build Up
M365 unused licences accumulate for predictable reasons. Understanding the root causes helps IT teams put processes in place to prevent waste from building up again after the initial audit.
Offboarding gaps: When an employee leaves, their Microsoft 365 account and licence are not always removed at the same time as their physical access is revoked. Without a formal offboarding process that includes licence reclamation, former employees’ accounts continue to consume licences and run up costs indefinitely.
Bulk purchasing without usage review: Organisations often buy licences in batches during a migration or headcount growth period, then fail to scale back when growth slows or projects end. Annual subscription commitments can make this feel locked in, but in reality, licences can often be reduced at renewal or by switching to a more flexible billing model.
Department-wide provisioning: IT teams sometimes assign licences by department or job family rather than by individual usage requirements. A department-wide Business Standard assignment might be appropriate for most users, but within any team there are almost always a few individuals who could operate effectively on Basic.
No regular licence review cycle: A one-off Microsoft 365 licence audit is a good start, but without a recurring review, waste starts to accumulate again within six to twelve months. The most effective approach is to treat licence management as an ongoing process rather than a periodic project, scheduling reviews at each renewal point and when any significant headcount change occurs.
For organisations that lack the internal capacity to maintain this regularly, Transputec’s Microsoft Modern Workplace practice provides ongoing licence management as part of a managed service, ensuring M365 unused licences are caught and reclaimed as part of normal operations.
How to Reduce Microsoft 365 Costs After Your Audit
Once you have the data from your Microsoft 365 licence audit, the next step is acting on it. Here are the most effective ways to reduce Microsoft 365 costs based on what a typical audit reveals.
Reclaim licences from inactive accounts
For any account that has not signed in for 30 or more days and belongs to a former employee, disable the account and remove the licence immediately. If the account is a current employee who has been on extended leave, keep the account but consider whether the full licence needs to remain assigned during that period.
Downgrade over-provisioned users
Use the Apps usage report data to identify users on Business Standard or Premium who show zero or minimal usage of desktop Office applications and Premium-only features. Downgrading these users to Business Basic is typically the fastest single action for Microsoft 365 licence cost reduction for small business and larger organisations alike.
Convert shared mailboxes
Where shared mailboxes are assigned full user licences, assess whether they qualify to operate without one. Shared mailboxes under 50GB with no active user sign-in requirement do not need a standard licence. Removing unnecessary licences from shared mailboxes can produce meaningful savings at scale.
Consolidate add-on licences
If your users are on Business Standard with security add-ons such as Defender for Business or Intune, compare the combined cost against Business Premium. Given that Business Premium did not increase in price during the July 2026 Microsoft pricing update while Standard rose by approximately 12%, the gap between Standard-plus-add-ons and Premium has narrowed. Consolidation often makes commercial sense. For a detailed breakdown of what is included in each tier, see our guide to Microsoft 365 Business Basic vs Standard vs Premium.
Put a licence review cadence in place
Schedule a formal licence review at every renewal point, and trigger a quick review whenever headcount changes by more than 10 per cent. Assign clear ownership for licence management within IT, and document the process so it does not rely on institutional memory. This prevents the cycle of licence accumulation from starting again after the initial cleanup.
| Action | Typical Saving | Effort |
|---|---|---|
| Reclaim inactive account licences | 5-15% of total spend | Low |
| Downgrade over-provisioned users | 8-20% per downgraded user | Low |
| Remove licences from shared mailboxes | Variable | Low |
| Consolidate Standard + add-ons into Premium | Up to 30% vs. Standard + add-ons | Medium |
| Implement a review cadence | Prevents future accumulation | Low-Medium |
Conclusion
A Microsoft 365 licence audit is not a one-off project. Licence waste builds up steadily as organisations grow, change, and restructure, and without a process to catch it, overspending on Microsoft 365 becomes the default position. The good news is that the tools to run an audit are already in your Admin Centre, and the savings, once identified, are straightforward to realise.
The July 2026 pricing update has made this more pressing than ever. Business Basic and Business Standard both became more expensive, while Business Premium held steady. For IT leaders who have not revisited their licence mix in the past twelve months, the numbers have changed. An audit run today may produce a different and more significant savings opportunity than one run a year ago.
Transputec works with UK businesses as a certified Microsoft Solutions Partner to carry out structured Microsoft 365 licence audits that give IT leaders a clear, evidence-based view of where their spend is going and what can be done to bring it under control. Get in touch to arrange a conversation with our team.
FAQs
How do I run a Microsoft 365 licence audit in the Admin Centre?
To run a Microsoft 365 licence audit in the Admin Centre, sign in at admin.microsoft.com and navigate to Reports, then Usage. Pull the Microsoft 365 Apps usage report to see which applications each user has opened in the last 30 days, and the Email activity report to check mailbox engagement. Cross-reference this data with the Active Users list to identify accounts with no recent sign-in activity. For a full audit, also check whether licence tiers match actual usage patterns and whether any add-on licences overlap with features already included in users’ plan tiers. Transputec’s Microsoft 365 team can carry out this analysis and provide a prioritised action plan.
How do I find unused Microsoft 365 licences in my organisation?
To find unused Microsoft 365 licences, go to the Microsoft 365 Admin Centre at admin.microsoft.com and review the Active Users list, filtering for accounts that have not signed in recently. Check the Microsoft 365 Apps usage report under Reports, then Usage, to identify users with zero application activity in the last 30 days. You can also cross-reference your active user list against current HR records to catch former employees whose accounts were not properly offboarded. These three steps together will surface the majority of M365 unused licences in most organisations. Transputec offers a structured Microsoft Modern Workplace licence assessment for businesses that want an independent review.
How much can I save by auditing my Microsoft 365 licences?
The savings from a Microsoft 365 licence audit vary by organisation, but 10 to 30 per cent of annual Microsoft 365 spend is a commonly cited range for businesses that have not reviewed their licences in the past twelve months. The largest savings typically come from reclaiming licences assigned to inactive or departed users, downgrading over-provisioned users from Business Standard or Premium to Business Basic, and removing unnecessary licences from shared mailboxes. For organisations also carrying security add-ons on top of Business Standard, consolidating into Business Premium, which did not increase in price during the July 2026 Microsoft pricing update, can produce additional savings. Transputec’s Microsoft 365 services team can model the exact saving opportunity for your tenant before any changes are made.
How often should a Microsoft 365 licence audit be carried out?
A Microsoft 365 licence audit should be carried out at least once a year, ideally timed to coincide with your Microsoft 365 renewal. It should also be triggered by any significant headcount change, such as a merger, restructure, or period of rapid hiring or redundancy. Without a regular review cadence, licence waste tends to accumulate between audits and the savings opportunity grows proportionally. For organisations that want continuous oversight rather than periodic reviews, Transputec’s Microsoft Modern Workplace managed service includes ongoing licence management as standard, ensuring M365 unused licences are identified and reclaimed as part of normal operations rather than discovered during an annual audit.
Can Transputec help with Microsoft 365 licence cost reduction?
Yes. Transputec is a certified Microsoft Solutions Partner and carries out structured Microsoft 365 licence audits for UK businesses as part of its Microsoft 365 services practice. The process covers a full review of licence assignments, usage data, and add-on licences, and produces a clear, prioritised set of recommendations for Microsoft 365 licence cost reduction. Transputec can also implement the recommended changes on your behalf and put an ongoing licence management process in place to prevent future waste. To find out more or arrange an initial conversation, contact us.
