Microsoft 365 offboarding: what IAM teams keep missing

TL;DR: Microsoft 365 offboarding failures can leave former employees able to access SharePoint, OneDrive, Teams, groups, and licenses after departure, creating data exposure and unnecessary cost, according to Zluri. The real governance issue is not just deprovisioning speed, but whether identity, data, and group membership are revoked as one lifecycle event.

NHIMG editorial — based on content published by Zluri: 5 Best Practices for Office 365 Offboarding in 2026

By the numbers:

• Only 20% have formal processes for offboarding and revoking API keys, and even fewer have procedures for rotating them.

Questions worth separating out

Q: What breaks when Microsoft 365 offboarding is incomplete?

A: Incomplete Microsoft 365 offboarding leaves former employees able to retain access through active sessions, inherited group membership, or shared collaboration spaces.

Q: Why do organisations need to treat offboarding as a lifecycle control?

A: Offboarding is a lifecycle control because identity state, data state, and entitlement state all change when an employee leaves.

Q: How can security teams tell whether Microsoft 365 offboarding is actually working?

A: Security teams should look for three signals: sessions end promptly, group and shared-space access disappears, and licences are reclaimed without leaving orphaned data behind.

Practitioner guidance

• Automate immediate session termination Build offboarding so active Microsoft 365 sessions are invalidated before any later cleanup, including password resets and licence changes.
• Remove inherited access paths in the same workflow Treat group, channel, and shared library removal as a required offboarding step, not a follow-up ticket.
• Transfer or retain data before account deletion Move OneDrive and related content to a controlled location before deleting the user account, and confirm retention requirements are met.

What's in the full article

Zluri's full blog post covers the operational detail this post intentionally leaves for the source:

• Step-by-step Microsoft 365 offboarding actions for sessions, passwords, and account blocking
• Practical handling of OneDrive transfer before account deletion and the 30-day data window
• How group, channel, and project removal is automated in the source workflow
• Licence reassignment and renewal alert handling for unused Microsoft 365 subscriptions

👉 Read Zluri's Microsoft 365 offboarding best practices for 2026 →

Microsoft 365 offboarding: what IAM teams keep missing?

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