Microsoft 365 Admin Readiness Checklist: 10 Essential Steps

• Inventory your licenses in the Microsoft 365 admin center under Billing > Your products
• Map licenses to user types:
• Heavy knowledge workers → Business Premium or E3/E5
• Frontline workers → F plans or Basic with web-only apps
• Admins & security staff → Strongly consider E5 or at least security add-ons
• Decide what to standardize on – avoid a random mix of SKUs per user unless there’s a clear reason

This also sets you up for later when you look at cis benchmark microsoft 365 or any m365 security assessment, because many benchmark controls depend on having the correct capabilities licensed.

Two common mistakes:

1. Over-licensing: Everyone gets E5 “just in case.” That sounds nice but adds a big bill without an actual security strategy.
2. Under-licensing: Expecting advanced microsoft 365 compliance features (like DLP, sensitivity labels, or advanced auditing) while only having low-end SKUs.

A quick sanity check now saves expensive cleanup later – especially when auditors ask which features are in scope for your m365 security audit.

In the Microsoft 365 admin center:
- Customize the Dashboard cards so you see health, usage, and alerts that matter
- Review Settings > Org settings for basics like external sharing, privacy, and security defaults
- Check Health > Service health to know how to verify incidents

In Entra (Azure AD):
- Review Users and Groups – this is your identity backbone
- Note sign-in logs and audit logs; they’re vital for any kind of microsoft 365 security audit or incident review later.

From a microsoft 365 compliance perspective:

• Entra handles identity-related controls (MFA, conditional access, user lifecycle)
• Defender addresses malware, phishing, and endpoint protections
• Purview is where you configure data protection and retention (very relevant for CIS, ISO 27001, NIS2, etc.)

Even if you’re not implementing full compliance yet, you should at least know which portal controls which part of your future m365 compliance checklist.

Ask these questions:

• Do you still have on-premises Active Directory?
• Do users sign into Windows devices joined to your local domain?
• Do you need a staged migration for thousands of users or legacy apps?

If yes, you’re probably heading for a hybrid identity:

• Use Azure AD Connect or Cloud Sync to synchronize users and groups
• Keep passwords in sync via password hash sync (recommended in most cases)
• Avoid overcomplicated federation unless you genuinely need it

If you’re cloud-native or new:

• Cloud-only identity in Entra is simpler and often more secure long term

Either way, this design affects your microsoft 365 audit preparation because auditors will ask where identities are managed and how they’re synchronized.

If you know you’ll be working with partners or customers:

• Use B2B guest access for contractors, vendors, and partners in Teams and SharePoint
• For custom apps and public portals, explore B2C to let customers sign in via Google, Facebook, etc.

From a compliance standpoint, be clear about:

• What guests can access
• How you remove or review guest accounts

These decisions eventually map into CIS and other frameworks under the umbrella of access control and least privilege.

When creating a user (whether in Microsoft 365 admin or Entra):

1. Naming standard
- Use a sane pattern like `surname.initial@domain.com` or `first.last@domain.com`
- Avoid random usernames like “Bob” if you ever plan to grow

2. Location
- Set the Usage location correctly – it affects licensing, data residency and some legal/compliance behavior.

3. Licensing
- Assign the correct base license (E3/E5/Business Premium, etc.)
- Disable apps they don’t need (for example, if some staff never use Stream or certain services)

4. Admin roles
- Only assign admin roles when necessary – and avoid handing out Global Administrator like candy.

All of this might sound basic, but it directly impacts your microsoft 365 compliance automation options later, because most assessment tools assume your identity and licensing model is at least somewhat consistent.

The transcript touched on a neat trick: user templates.

• Create a user once (with all the right licenses, locations, and settings)
• Save that configuration as a template (e.g., “Full-time staff,” “Contractor,” “Frontline agent”)
• Reuse the template for new accounts

Longer term, you might progress to:
- PowerShell scripts for bulk user creation
- Identity governance / access packages in Entra for automated onboarding and offboarding

And if you later adopt microsoft 365 compliance automation tools (like ConfigCobra or others), having a predictable user model makes automated m365 compliance assessment significantly easier.

• Keep the number of Global Administrators to an absolute minimum
• Use dedicated admin roles like:
• Exchange Administrator
• Teams Administrator
• SharePoint Administrator
• Security Administrator
• Compliance Administrator
• Give people only what they need for their job, not what’s easiest in the short term

This not only reduces risk, it also aligns very nicely with CIS and ISO 27001 requirements around privileged access.

• Consider separate admin accounts (e.g., `firstname.admin@domain.com`) for high-risk tasks
• Require MFA on all admin accounts as a non-negotiable
• Periodically review admin role assignments – at least quarterly, ideally monthly

These practices become strong evidence points later when you go through any m365 security audit or respond to customer security questionnaires.

1. Security groups
- Purely for assigning permissions (to sites, apps, etc.)

2. Mail-enabled security groups
- Same as security group, but can also receive mail

3. Distribution lists
- For email distribution only; no shared resources

4. Microsoft 365 groups
- Full collaboration experience with:
- Shared mailbox
- Shared calendar
- SharePoint site & document library
- Planner, OneNote, and more

A Microsoft Team is essentially an extended Microsoft 365 group with chat, channels, apps, and meetings layered on top.

• Decide when to use security groups vs Microsoft 365 groups
• Standardize naming conventions for teams and groups (e.g., `HR-Internal`, `Project-ABC`, `Location-Aberdeen`)
• Decide who can create Microsoft 365 groups and Teams:
• Everyone (default, but can get chaotic)
• Restricted to certain users or admins
• Set appropriate privacy settings:
• Public groups: discoverable and joinable by anyone in the org
• Private groups: membership controlled by owners

Getting this right early reduces permission sprawl and makes life easier if you’re later mapping permissions to a cis benchmark microsoft 365 guide or similar framework.

In the Exchange admin center, you’ll usually see four main approaches:

• IMAP migration – email only, from non-Exchange systems
• Cutover migration – move everything at once from smaller Exchange environments
• Staged migration – move in batches over time from older on-premises Exchange
• Hybrid deployment – long-term coexistence, ideal for large or complex environments

Your choice of method will also influence how you synchronize identities and what kind of audit trail you maintain during the transition.

Remember how storage is laid out:

• SharePoint Online – storage for sites, Microsoft 365 groups, and Teams
• OneDrive for Business – storage for individual users

Microsoft’s backend provides built-in redundancy (multiple replicas, cross-rack, cross-datacenter), plus versioning and restore capabilities. That still doesn’t mean you can ignore backup or retention planning.

From a compliance angle:
- Document where your data resides (region/geo)
- Decide if you need third-party backup for extra assurance
- Make sure retention requirements (for legal or regulatory reasons) are reflected in Purview policies later

In Entra and Defender, prioritize:

• Multi-Factor Authentication (MFA) for all users, especially admins
• Baseline or conditional access policies to block legacy auth and enforce MFA
• Anti-malware / anti-phishing policies in Defender for Office 365
• Device onboarding into Intune if you plan to manage endpoints

All of these will be foundational controls when you later run a m365 security assessment or an external microsoft 365 security audit.

In Microsoft Purview, start small but deliberate:

• Enable audit logging (if not already on)
• Decide basic retention policies (e.g., keep all mail for 7 years) aligned to your legal requirements
• Start exploring sensitivity labels and data loss prevention (DLP) for obvious sensitive data like credit cards or national IDs

This is where the idea of microsoft 365 compliance automation becomes attractive: instead of manually checking 100+ settings, you can lean on automated tools to verify whether these controls match specific benchmarks like cis microsoft 365 foundations.

At minimum, track:

• Identity & access
• MFA enabled for all users
• Admin roles reviewed and minimized
• User lifecycle process (joiners/movers/leavers)

• Data protection
• OneDrive & SharePoint sharing defaults
• External access strategy (guests, B2B)
• Basic retention policy in place

• Security
• Baseline Defender policies enabled
• Device management plan (Intune vs unmanaged)

• Logging & audit
• Audit log enabled
• Plan for exporting or archiving key logs (if required)

This simple list will evolve naturally into something that maps to CIS, ISO, SOC 2, or NIS2 later.

Manually checking dozens of settings across multiple portals is painful and easy to get wrong. This is where automated compliance m365 tooling starts to earn its keep.

For example, ConfigCobra provides an automated m365 compliance assessment against the CIS Microsoft 365 Foundations Benchmark. It continuously evaluates 129 CIS controls at Level 1 (essential) and Level 2 (enhanced), and then outputs audit-ready reports and remediation guidance.

You don’t have to adopt this on day one, but keeping it in mind while you design your tenant means your configurations will be easier to validate later.

The cis benchmark microsoft 365 is a widely recognized hardening guideline for Microsoft 365 tenants. It’s especially useful because:

• It’s concrete: 129 specific controls with recommended configurations
• It maps well to other frameworks (ISO 27001, NIS2, HIPAA, PCI DSS, NIST CSF)
• It gives you a solid answer when customers ask: “How do you secure Microsoft 365?”

Adopting CIS-aligned practices early means that how to prepare for microsoft 365 security audit becomes a smaller, incremental task rather than a giant, stressful project.

To actually keep up with CIS in a live tenant, you’ll probably want automation.

ConfigCobra is one of the microsoft 365 compliance automation tools that’s purpose-built for this:

• Continuously checks Microsoft 365 against the CIS Microsoft 365 Foundations Benchmark
• Assesses all 129 CIS controls across Level 1 and Level 2 profiles
• Schedules assessments daily, weekly, or monthly
• Detects configuration drift so you know when something slips out of compliance
• Generates PDF reports with evidence and remediation guidance – very handy for auditors
• Maps CIS controls to other standards like NIS2, HIPAA, PCI DSS, ISO/IEC 27001, NIST CSF
• Supports custom rule sets for your own policies (e.g., SOC 2 or GDPR focus)

If you walk through this checklist and then run a structured CIS-based assessment in a tool like ConfigCobra, you’ve basically turned your initial setup into a foundation for continuous, auditable security posture.

You can explore how those assessments work at https://configcobra.com/docs/assessments