Microsoft 365

The Microsoft 365 subscription can still be used to activate an older Office version that is compatible with the Mac, even if the latest Microsoft 365 apps cannot be installed on the current macOS.

For older Macs (such as those running macOS Monterey or earlier), the correct approach is to install the most recent Office build that supports that macOS version, then sign in with the Microsoft 365 subscription account to activate it. This restores access to Word, Excel, Outlook, etc., without needing to purchase a different product.

The recommended guidance is to follow the “Most Recent Office You Can Run – Best Practices” steps, which explain how to:

1. Download the latest Office build that supports the specific macOS version.
2. Install that older Office build.
3. Sign in with the Microsoft 365 subscription account to activate it.

If an older Office version is already installed on the Mac but is currently deactivated, it can be unlocked by installing the compatible build and then signing in with the active Microsoft 365 subscription. After installing the compatible version, running Help > Check for Updates once (where available) ensures the Mac is on the final supported build for that OS.

If the purchase truly cannot be used on any device (for example, no compatible Mac or PC is available), support articles also note that it is still possible to install an earlier Office version on older Macs and activate it with the purchased license, rather than needing a refund.

References:

• Help! I can't get 365 to work. Can I use it on my MacOS or do I need Office? - Microsoft Q&A
• How to I contact someone to process a refund on a purchase that is incompatible with my computer? - Microsoft Q&A
• Office running on OS 12.7.6 - Microsoft Q&A
• Download, install, or reinstall Microsoft 365 or Office 2024 on a PC or Mac