A Microsoft 365 tenant gets messy over time. Here’s how SMEs clean up users, permissions, sharing, and security settings to reduce risk quickly.
Most Microsoft 365 tenants start tidy — then real life happens. People join, people leave, suppliers get temporary access, Teams and SharePoint sites multiply, and “we’ll fix it later” becomes the default. Over time, you can end up with unnecessary admin roles, stale guest accounts, unclear mailbox permissions, and inconsistent security settings. None of this feels urgent day-to-day, but it adds up to real risk.
A tenant cleanup is one of the most cost-effective security improvements an SME can make because it reduces “unknowns.” It’s not a replatforming project — it’s a structured reset: confirm who should have access, tighten what they can do, and make sure logging and policies are in place.
Amazing Support is a multi-award-winning, Microsoft Partner and Cyber Essentials Plus certified provider supporting UK SMEs across London, Greater London and Manchester — and we often see tenant cleanups deliver immediate improvements in security and manageability.
In plain English: a Microsoft 365 tenant cleanup is a structured review and tidy-up of users, access, sharing, and security settings so your environment matches how the business operates today.
The 6 areas to clean up (in the right order)
1) Users and leavers
- remove or disable stale accounts
- confirm mailbox handling for leavers
- ensure joiner/leaver process is consistent
2) Admin roles and privileged access
- reduce the number of global admins
- ensure admin accounts are protected properly
- remove “temporary” admin rights that became permanent
3) Guest access and external sharing
- review guest users
- tighten sharing defaults
- remove guests tied to old projects
4) Mailbox permissions and shared mailboxes
- confirm who has access and why
- remove legacy access
- avoid shared passwords entirely
5) Conditional Access and MFA posture
- ensure MFA is enforced appropriately
- reduce risky exceptions
- align policies with device compliance where possible
6) Logging, alerting, and audit readiness
- confirm audit logs are enabled and retained appropriately
- ensure you can investigate suspicious activity quickly
Common mistakes
- cleaning up Teams/SharePoint first, before identity and admin access
- leaving too many admins “for convenience”
- not reviewing guest access regularly
- making changes without documenting decisions
FAQ
Is a tenant cleanup disruptive?
It shouldn’t be, if done carefully. The key is staged changes, clear comms, and a rollback mindset for anything that affects access.
How often should SMEs do this?
At least annually, and after major changes (mergers, leadership changes, big hiring phases).
If your Microsoft 365 environment has grown organically, we can run a structured tenant cleanup that reduces risk fast and leaves you with a clear, maintainable baseline.
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