If your business runs on Microsoft 365, you're probably already paying for some AI. Microsoft says Copilot Chat comes with eligible business plans at no extra cost. It's a web-grounded assistant, and it includes Copilot in Outlook.

The paid add-on is a different product. It brings Copilot into Word, Excel, PowerPoint and Teams, works from your own email, files, calendar and meetings, and includes pre-built agents like Researcher and Analyst. It's sold for businesses with up to 300 users, billed monthly or yearly, but committed for a year. Microsoft also sells it bundled: Business Standard with Copilot at $23.50 and Business Premium with Copilot at $32 per user per month, paid yearly.

The math for a 25-person office: 25 × $21 × 12 = $6,300 a year. Five seats is $1,260.

Most of a 25-person team won't use the paid features enough to justify a year's commitment on day one. The people who spend their day in Outlook, Excel and Teams meetings might. Start with them.

Before you buy, check

  1. Who uses the free version. Run Copilot Chat for 30 days, then ask who used it and for what.
  2. Your file permissions. Microsoft says Copilot only surfaces data a user already has permission to see. If your SharePoint and OneDrive sharing is a mess, Copilot makes that mess easier to find. Lock down payroll and HR folders first. (Microsoft: data, privacy and security)
  3. Your renewal date. It's a year-long commitment, so calendar the decision before you buy.