Most Microsoft 365 security incidents don’t come from sophisticated attacks — they come from a small, recurring set of avoidable misconfigurations. Recognising these is often more valuable than any single security tool.
This is consistently the most common and highest-impact gap. Partial MFA rollout — enabled for some accounts, skipped for others — leaves an obvious path in for anyone attempting credential-based access.
Microsoft 365’s default sharing settings often favour convenience over restriction. Left unreviewed, this leads to files and folders being accessible more broadly than intended — sometimes externally, without anyone realising it.
Without conditional access rules, accounts can typically be accessed from any device, anywhere, under any conditions — which removes an entire layer of context-based protection that’s available but not automatic.
Account deprovisioning is often incomplete or delayed. A departed employee’s account — with all its historical access to files and email — remaining active is a persistent, quiet risk that lingers well past the point anyone’s thinking about it.
Microsoft 365’s built-in retention policies aren’t the same as a true backup solution, and businesses relying on retention alone often discover the gap only when they actually need to recover lost or corrupted data.
Microsoft 365 can surface unusual sign-in patterns — logins from unexpected locations, impossible travel between sign-ins, repeated failed attempts — but only if that monitoring is actively configured and someone is watching for the alerts.
Using an administrator account for routine, day-to-day tasks unnecessarily increases the potential damage if that account is ever compromised. Dedicated admin accounts, used only for administrative tasks, meaningfully limit that exposure.
Beyond the direct security implications, unused or misallocated licenses often indicate a broader lack of oversight — accounts that should have been deprovisioned, or access granted without a clear ongoing need.
None of these mistakes are the result of Microsoft 365 being poorly designed — the platform includes the tools to address every one of them. They persist because proper configuration and ongoing review require deliberate, continuous attention that many businesses simply don’t have the internal bandwidth to sustain.
If more than one or two of these sound familiar, that’s a reasonable signal your Microsoft 365 environment could use a proper security review. Get in touch with BFF-IT to find out exactly where you stand.
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