Microsoft 365 documentation patterns

A Microsoft 365 tenant runs on a thousand small configuration decisions made over years. Documentation captures the "why" behind those decisions so future admins (and future-you) can operate intelligently rather than blindly. Without documentation, tenants accumulate fragile undocumented configurations that become impossible to safely change.

What to document

For a serious Microsoft 365 deployment:

Identity and access

• Tenant configuration — name, primary domain, region, top-level admin model.
• Entra ID admin roles — who has what, why, with PIM eligibility.
• Conditional Access policies — every policy with stated purpose.
• Break-glass accounts — how they work, where credentials are stored, recovery procedure.
• Authentication methods — which methods enabled, which are required.

Data and content

• SharePoint site taxonomy — what sites exist, why, who owns them.
• Hub structure — which hubs, how they nest.
• Sensitivity label taxonomy — labels published, what they mean.
• Retention policies — what's preserved, for how long, why.
• DLP policies — what's detected, what's blocked, what's the override path.

Email and messaging

• Exchange transport rules — what each does, why it exists.
• DKIM/DMARC/SPF — current state and posture.
• Connectors — inbound and outbound.
• Defender for Office 365 policies — protection level, exceptions.

Devices and apps

• Intune configuration profiles — purpose, scope.
• Compliance policies — what defines "compliant," why.
• Apps deployed via Intune — what's there, version, owner.
• Conditional Access app control configuration — proxied apps and policies.

Collaboration

• Teams policies — meeting, messaging, app, voice. What's allowed, why.
• Microsoft 365 Groups governance — naming, expiration, creation policy.
• External sharing posture — settings per service.

Security

• Defender XDR configuration — auto-investigation level, attack disruption settings.
• Defender for Endpoint — onboarding, ASR rules, exclusions.
• Defender for Office 365 — preset policies, customisations.
• Defender for Identity — sensors deployed, tuning exceptions.

Operations

• Service principals and apps — what's there, what permissions.
• PowerShell scripts in use, with owner and purpose.
• Power Platform environments and DLP policies.
• Backup configuration — what's backed up, retention, restore procedure.
• Disaster recovery runbook.

Where documentation lives

Recommended pattern: a dedicated SharePoint communication site for IT documentation, with appropriate read permissions:

• Each topic gets a page or set of pages.
• Pages are kept current — outdated info worse than no info.
• Owners assigned per documentation area.
• Periodic review schedule (quarterly).
• Search-optimised titles so users find what they need.

Alternative: Wiki tools like Notion or Confluence, but the Microsoft 365 site has the advantage of being in the same surface as the rest of the tenant.

Structure that scales

A consistent structure across pages helps maintain documentation:

• Purpose — what this configuration does.
• Configuration details — settings, scope.
• Owner — who's accountable.
• Last reviewed — date.
• Related items — links to related configuration.
• Notes — special considerations, gotchas.

Template-driven pages keep the documentation comparable.

Preventing rot

The biggest documentation problem: it rots. The page describing "our Conditional Access baseline" describes the baseline from 18 months ago. Several patterns help:

• Quarterly review of each documentation area by its owner.
• "Last reviewed" date prominently shown — readers can tell if info is stale.
• Tickets / change requests trigger documentation updates as part of the workflow.
• Annual audit — walk every page; flag stale ones for refresh.
• Onboarding documentation reviews — new joiners reading the docs catch outdated info.

Configuration-as-code patterns

For organisations going further, infrastructure-as-code approaches let you treat configuration as version-controlled artifacts:

• PowerShell scripts that define configuration — checked into Git.
• JSON / YAML configuration files consumed by deployment tooling.
• Terraform / Bicep for Azure resources backing Microsoft 365.
• PSDesiredStateConfiguration for Intune profile management.

This pattern makes the source of truth the code repository, with documentation generated from it. More work to set up; far less prone to rot.

What not to over-document

• Microsoft's own documentation — don't reproduce what learn.microsoft.com covers.
• Trivial settings — every minor toggle doesn't need a page.
• Personal preferences — admin preferences that change with personnel.
• Vendor-specific marketing — Microsoft's marketing pages aren't documentation.

Focus on decisions specific to your tenant that don't appear elsewhere.

For Microsoft 365 customers serious about long-term operations, documentation is the difference between a tenant that survives staff changes intact and one where every personnel transition causes lost knowledge. Invest deliberately; review periodically; treat the documentation as a real artefact of the operation, not an afterthought.