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Microsoft has warned that starting July 13, 2026, Office apps on older Apple devices will enter a “reduced functionality mode” that prevents creating, editing or saving files — allowing only viewing and printing.
The change affects Microsoft 365 subscribers and standalone versions including Office 2019 and Office 2021 on macOS, iPhone and iPad when devices run unsupported operating systems.
Microsoft says macOS 12 Monterey, iOS 17 and iPadOS 17 will be the minimum supported versions; devices that cannot upgrade will lose editing capabilities.
Microsoft attributes part of the disruption to an expiring security certificate: the company renewed the certificate and updated newer Office releases to recognise it but did not provide an update path for Office 2019 for Mac, which will effectively become read-only.
Affected users are advised to update device OS and Office apps, use the free web versions of Microsoft 365, or subscribe to Microsoft 365.
Microsoft says it will email affected customers who cannot upgrade.
Windows Office versions are not impacted by the certificate issue.







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