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Fix Office 2021 Requires macOS 12 Error on Older iMac
Question details
The user is attempting to install Office Home and Student 2021 on an older iMac but receives an error stating that the software requires macOS 12 or later.
- Product
- Microsoft Office Home and Student 2021
- Device & OS
- macOS Big Sur 11.7.10
- Scenario
- Installing a newly purchased Microsoft Office suite on an older Mac that is no longer receiving major operating system updates.
- Observed behavior
- The installation is blocked because the Mac is capped at macOS Big Sur 11.7.10, while Office 2021 strictly requires macOS 12 (Monterey) or a newer version to run.
Verify your exact iMac model year in the 'About This Mac' menu to determine if it is hardware-limited to Big Sur or if an upgrade to macOS 12 is officially available.
Check for macOS 12 Upgrade Eligibility
Determine if your Mac model officially supports macOS 12 Monterey and install the update to meet the Office 2021 system requirements.
Microsoft's support policy for Mac restricts Office 2021 installations to the three most recent major macOS versions. To install the desktop software, you must upgrade your operating system.
Click the Apple icon in the top-left corner of your screen and select 'About This Mac' to view your device's model and release year.
Confirm that your iMac is on Apple's supported list for macOS 12 Monterey (generally late 2015 models and newer).
If your device is compatible, go to System Preferences > Software Update. Download and install the macOS 12 update, then attempt the Office 2021 installation again.
Use Microsoft 365 Online via Web Browser
If your iMac cannot upgrade past Big Sur, use the free web-based version of Microsoft Office as a functional workaround.
Use WPS Office on Older Macs Without Compatibility Issues
Since Microsoft Office 2021 blocks installation on older operating systems like macOS Big Sur, WPS Office provides a perfect, lightweight alternative. It guarantees high compatibility with older Macs while allowing you to natively open and edit standard Microsoft formats for free.
- 1. Download the Mac installer: Visit the official WPS Office website and download the Mac installation package.
- 2. Install on your iMac: Open the downloaded .dmg file and drag the WPS Office icon to your Applications folder.
- 3. Open MS Office files: Launch WPS Office and directly open your existing Word, Excel, or PowerPoint files without encountering version compatibility errors.
Frequently Asked Questions
Why does Office 2021 require macOS 12 or later?
Microsoft maintains a policy of supporting only the three most recent major versions of macOS to ensure security, performance optimization, and compatibility with new features. As Apple releases new macOS versions, older ones like Big Sur lose support.
Can I download an older version of Office 2021 that works on Big Sur?
No, Microsoft does not provide a separate legacy installer for Office 2021. While older versions of Office 2019 might technically install on Big Sur, an Office 2021 product key will generally not activate them.
Will my Office Home and Student 2021 license work if I buy a new Mac?
Yes. Your Office 2021 license is tied to your Microsoft account, not the specific computer. You can log into your account on a newer Mac running macOS 12 or later and install the software without repurchasing.
