A 30-person law firm running Microsoft 365 might have eight Global Administrators. The founder has the role because the tenant was opened with that account. Two outside IT contacts have it because broad access was faster during setup. The office manager received it to create users, and several old admin accounts still hold it because nobody removed the role after a project ended.
This is a generic example, yet the pattern is common in tenants that have grown without a regular access review. Every one of those accounts can change the controls protecting the entire firm. One stolen password, one approved MFA prompt, or one compromised outside provider can become a tenant-wide incident.
Global Admin reaches further than most owners realize
Global Administrator is the highest Microsoft Entra role. It can assign administrative roles, change identity settings, alter Conditional Access policies, reset authentication methods, and approve applications across the organization. A Global Admin does not automatically read every mailbox or open every SharePoint file. It can give itself or another account the permissions needed to reach much of that data, which makes the distinction small during an attack.
Consider the difference between a stolen standard account and a stolen Global Admin account. The standard account exposes one person's email, files, and contacts. That is serious, especially when the mailbox can be used for invoice fraud. The privileged account lets an attacker weaken sign-in rules, create another administrator, approve a malicious app, and interfere with the logs used to investigate what happened. The possible damage expands from one user to the whole tenant.
The same privilege also creates accidental risk. An administrator working quickly can change an organization-wide sharing setting while trying to fix one site, or disable a policy that affects every employee. Broad access turns a small mistake into a large one.
Convenience creates permanent privilege
Most Global Admin sprawl begins with a reasonable request. Someone needs to add a domain, configure email, connect a backup product, or solve a sign-in problem. Global Admin makes the permission error disappear, so the role gets assigned. The project ends and the access stays.
Daily use makes the exposure worse. An owner who reads email, opens attachments, and browses the web from the same account used for administration gives phishing far more chances to reach privileged credentials. A successful MFA fatigue or session theft attack against that everyday account can deliver administrative control along with the inbox.
Outside support accounts deserve the same attention. A provider may need a specific role for a project, though that need rarely lasts forever. If three vendors each leave one Global Admin behind, your security now depends on the sign-in controls and offboarding practices at three other companies. The tenant may look tidy from the employee list while its most powerful access sits elsewhere.
Give each job the role it needs
Microsoft 365 includes narrower roles for routine work. Exchange Administrator covers email configuration. SharePoint Administrator handles sites and sharing. User Administrator manages many common account tasks. Authentication Administrator supports authentication methods for regular users. Billing Administrator handles subscriptions and purchases.
Using those roles changes the outcome of a compromised account. A billing account cannot rewrite Conditional Access. A SharePoint administrator cannot assign itself Global Administrator. Containment is still required. The first compromised credential no longer hands over the entire organization.
Start by matching each administrative task to the smallest role that completes it. An office manager who creates users may need User Administrator. A consultant working on email may need Exchange Administrator for the project window. Someone reviewing application permissions should have the relevant identity role instead of a permanent master key. This is the same reason user consent needs limits, as explained in the app that walks past MFA. Permission should follow the work being done.
Privileged Identity Management can tighten this further for firms with the right Microsoft licensing. An eligible administrator activates a role only when needed, provides a reason, completes strong authentication, and loses the role when the approved window ends. A two-hour activation is much safer than a role that remains live for two years.
Separate daily work from administration
Anyone who performs privileged work should have a dedicated admin identity alongside their normal account. The normal account handles email, Teams, documents, and web browsing. The admin identity has no mailbox for daily correspondence and is used only in Microsoft administration portals.
Separation removes many ordinary phishing opportunities from the privileged account. A fake document share sent to the user's normal inbox may still be dangerous, although it does not carry Global Admin rights when opened. The administrator also gets a useful pause before making a tenant-wide change because signing into the separate account is a deliberate act.
Strong authentication matters most on these identities. Phishing-resistant passkeys or hardware security keys give privileged accounts stronger protection than SMS codes or simple push approvals. Conditional Access should restrict where and how the accounts can sign in, with every exception documented and tested. Our Microsoft 365 security work covers the identity, device, email, and data controls around these accounts as one connected system.
Keep two emergency paths and watch them closely
Reducing permanent Global Admins does not mean leaving the firm unable to recover from a lockout. Keep two cloud-only emergency access accounts that are separate from normal staff identities and any outside identity provider. Two accounts protect against a credential problem affecting one of them.
Store their credentials separately in controlled locations, restrict who can retrieve them, and test the recovery procedure on a schedule. Any sign-in or role activity from an emergency account should create an immediate alert because routine work should never use it. If one appears in the logs on an ordinary Tuesday, someone needs to investigate at once.
Emergency accounts also need owners. Write down who can authorize their use, how access is recorded, and what happens after an activation. Rotate exposed credentials, review the changes made during the session, and confirm that the account has returned to its protected state.
A short review can remove years of risk
Open the Microsoft Entra admin centre and export the list of assigned roles. Count every active Global Administrator, including guests, service identities, and accounts that belong to outside providers. For each one, record the owner, the work that requires the role, and the date that need will end.
The target is a tenant where Global Admin is rare, separate from daily work, and visible whenever it is used. Replace broad roles with specific ones, move temporary access into an approval window, protect privileged identities with phishing-resistant authentication, and remove accounts that nobody can explain. Repeat the review every quarter and after any change of staff or provider.
Professional-services firms already hold enough sensitive material to attract attention. Their most powerful cloud accounts should receive the strictest controls in the environment. The broader baseline in Microsoft 365 security for law firms shows how privileged access fits with Conditional Access, audit logging, data protection, and secure collaboration. Teclara's managed security and compliance service can assess those controls together and turn the findings into a practical security plan.