What Microsoft 365 Copilot actually is
Microsoft 365 Copilot is an add-on subscription that integrates an LLM into Word, Excel, PowerPoint, Outlook, Teams, OneNote, Loop and Microsoft 365 Chat. Unlike consumer Copilot or Copilot Pro, it can ground its responses in your organisation's Microsoft 365 data — your SharePoint sites, OneDrive, Teams chats, Outlook mail and calendar — using a permission-aware retrieval layer called Semantic Index.
What it costs in Australia
USD $30 per user per month, annual commitment, which converts to roughly AUD $45 depending on the day's exchange rate and Microsoft's regional adjustment. Microsoft has run several regional promotions in Australia (notably the 'Copilot for All' promotional discounting) — check with your reseller for current pricing. Copilot is on top of an existing M365 licence; you must hold E3, E5, Business Standard or Business Premium to add it.
The SharePoint oversharing risk
The single biggest reason Copilot rollouts get pulled back in Australia is SharePoint oversharing. Copilot inherits the permissions of the user asking, so if your SharePoint sites are over-permissioned (which is the default in tenants that grew organically), Copilot will surface content the asking user technically had access to but never realised. Run an oversharing audit before rollout — this is what /tools/sharepoint-oversharing exists for.
How to model the ROI
Copilot ROI hinges on three numbers: hours saved per user per week, fully-loaded employee cost per hour, and adoption rate. Microsoft's research suggests 10–15 percent productivity uplift for knowledge workers; field experience in Australian midmarket suggests 2–4 hours per week at six months for active users, with active rates of 60–80 percent at six months. Use /tools/copilot-roi to model your specific case in AUD.
Common mistakes
Buying Copilot before fixing identity, oversharing and sensitivity labels is the most common mistake. Copilot amplifies whatever data hygiene you already have. The second most common mistake is licensing all knowledge workers at once instead of piloting roles where the time-saving payback is highest first (executive assistants, finance analysts, HR business partners, sales coordinators).