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Fix Microsoft Office Not Installing After macOS Reinstall on iMac
Question details
The user is unable to install Microsoft 365 or Office on an iMac after reinstalling macOS due to operating system compatibility errors.
- Product
- Microsoft 365
- Device & OS
- macOS
- Scenario
- Reinstalling the macOS operating system on an iMac and subsequently attempting to download and install Microsoft Office.
- Observed behavior
- The Office installer fails to run, displaying an error message stating that the software is incompatible with the current macOS version or requires a newer operating system.
Before troubleshooting, click the Apple menu and select 'About This Mac' to confirm your exact macOS version (e.g., Ventura, Monterey), as this determines which Office installer you need.
Upgrade iMac to the Latest Supported macOS
Microsoft 365 only supports the three most recent major versions of macOS. Upgrading your OS is the most straightforward way to fix installation compatibility issues.
Microsoft regularly updates its support requirements for Mac devices. If your iMac is running an older macOS version after a factory reset or reinstall, the latest Office installer will reject it. Upgrading to a newer OS like macOS Sonoma or Ventura will resolve this.
Open the Apple menu, select 'System Settings' (or 'System Preferences'), and click on 'General' > 'Software Update'.
If a newer macOS version is available, click 'Upgrade Now' or 'Update Now'. Allow the iMac to download the installer and restart.
Once the iMac restarts on the updated macOS, log into the official Microsoft 365 website, download the latest Mac installer, and run it again.
Install a Compatible Older Version of Office for Mac
Use this solution if your iMac hardware is too old to support the newest macOS versions but you still want to install Microsoft Office.
Try WPS Office for Mac – Lightweight and Highly Compatible
If your iMac's older macOS prevents you from installing Microsoft 365, WPS Office is an excellent free alternative. It runs smoothly on older hardware, offers a familiar interface, and provides seamless compatibility with Microsoft Word, Excel, and PowerPoint formats without forcing you to upgrade your operating system.
- 1. Download the Installer: Visit the official WPS Office website and download the Mac version installer.
- 2. Install WPS Office: Open the downloaded .dmg file and drag the WPS Office icon into your Applications folder.
- 3. Launch and Edit: Open WPS Office from Launchpad and start creating or editing your documents immediately.
Frequently Asked Questions
Why does Microsoft 365 require the latest macOS versions?
Microsoft policy dictates that Microsoft 365 and Office for Mac only support the three most recent major versions of Apple's macOS. This ensures that the software receives optimal performance, the latest security protocols, and new feature integrations. When Apple releases a new macOS, the oldest of the three supported versions is dropped.
Can I still use my Microsoft 365 subscription on an older iMac?
Yes. If your iMac cannot run a supported macOS, you can still use your active Microsoft 365 subscription by installing an older version of Office for Mac that is compatible with your operating system. However, you will not receive new features or security updates.
What should I do if the older Office installer also fails?
If an older compatible installer fails to run, you may have residual files from previous failed installations. You can use the Microsoft Support and Recovery Assistant or manually delete old Microsoft application files from your Mac's Library folder before attempting a fresh installation.
How do I know which macOS versions are currently supported by Office?
You can check Microsoft's official system requirements page for Microsoft 365. It generally lists the top three latest operating systems (for example, macOS Sonoma, Ventura, and Monterey). If your macOS is older than the ones listed, you will face installation errors with the newest installers.
