How to reduce Microsoft 365 costs by 30% — the AU CFO's audit checklist

Microsoft 365 spend in Australian businesses grows faster than headcount. The reasons are predictable — bundled SKUs that nobody audits, frontline workers carrying knowledge-worker licences, third-party tools running alongside Microsoft equivalents that nobody retired, Copilot seats sitting on disabled accounts, retention defaults that nobody changed. None of these are fraud or deliberate waste. They're inertia. And inertia compounds.

Six audit checks, run together, consistently reclaim 25–40 percent of Microsoft 365 spend in Australian midmarket. Two days of work; meaningful AUD outcome. Run them in order.

Check 1: Disabled and ex-employee licences

Pull the active user list from Entra ID. Pull the assigned-licence list from the Microsoft 365 admin centre. Cross-reference. Every disabled or terminated user still holding a licence is direct waste. We see 3–8 percent of total licence spend sitting here in tenants that don't have a tight offboarding runbook. Fix: tighten offboarding to deassign licences within 24 hours of disable; run the audit monthly.

Check 2: Frontline workers on knowledge-worker licences

Pull the licence-by-user list. Categorise users by role — knowledge worker, frontline (shift, retail, hospitality, transport, healthcare aide), executive. Compare assigned licence to role. Frontline workers on Microsoft 365 E3 (~AUD $54/user/month) when F3 (~AUD $12) would cover their actual usage are the single biggest waste category in retail, hospitality and healthcare clients. Saving on a 200-frontline-staff retailer: AUD $100,000+/year.

Check 3: Third-party tool duplication

List every third-party SaaS subscription. For each, ask: 'is there a Microsoft 365 component already paid-for that does the same thing?'. The most common duplications: third-party email security (Defender for Office 365 covers it), third-party MDM (Intune covers it), third-party identity governance (Entra ID covers it), third-party CASB (Defender for Cloud Apps covers it for E5), Visio competitors (Visio Plan 2 in E5 covers it), standalone Power BI Pro (in E5 already), separate diagram tools (Loop and Whiteboard cover most use cases), separate meeting tools (Teams covers them). Each duplication is licence waste — but switching is a project, not a check-box. Prioritise the biggest duplications first.

Check 4: Copilot zombie seats

If you have Microsoft 365 Copilot deployed, pull the active-user data from the Copilot usage report. Identify any seat that has had zero active use in 30 days. These are zombie seats. The honest options: redeploy them to a new user where the AUD payback is more concentrated, or remove them at the next renewal. Copilot is annual commit — you can't get this AUD back this year, but you can stop the bleed at the next renewal cycle. Field-typical: 10–25 percent of seats are zombies in tenants that didn't run a proper rollout.

Check 5: Retention and storage sprawl

Microsoft 365 storage charges compound silently. SharePoint storage overage at AUD $200/TB/month adds up; Sentinel retention compounds at USD $0.10/GB/month; Exchange archives can grow to multiples of mailbox size. Audit: SharePoint sites with anomalous growth (often abandoned project sites with attached video files), Exchange mailboxes over 50 GB held for departed staff, Sentinel retention beyond your actual regulatory requirement. Tighten retention policies based on the documented requirement, not the default.

Check 6: Support tier mismatch

Microsoft sells multiple support tiers — included, ProDirect, Premier, Unified Support. Many Australian midmarket tenants pay AUD $50,000+/year for Premier or Unified Support and use it twice a year. Three questions: (1) what does our actual support consumption look like; (2) does our reseller already include comparable response time; (3) do we genuinely need direct Microsoft engineering escalation paths for the cases we open. The honest answer for most midmarket is no — and the right move is downgrading to ProDirect or Cloud Solution Provider partner support.

Stack the checks — 30 percent saving is realistic

Six checks run together typically reclaim 25–40 percent of Microsoft 365 spend in Australian midmarket. For a 500-staff business with AUD $1.2M annual M365 spend, that's AUD $300,000–480,000/year reclaimed — every year, compounding. The audit takes two days; the tighter operational discipline that follows takes ongoing effort but pays back continuously.