Because Microsoft employs a rolling support window covering only the three most recent versions of macOS, attempting to download the modern desktop sync client will block installations. However, your data is not lost, and your machine is still highly functional.
macOS 10.13.6 no longer receives root certificate updates from Apple. This means Let’s Encrypt and other modern SSL certificates may appear invalid, breaking the secure connection to *.onedrive.com .
OneDrive on Mac High Sierra (any alternative to official client?) onedrive for macos 10.13.6
Microsoft OneDrive is a cloud storage and file synchronization service. For users running , the application is in a legacy support state . This means while the core functionality (syncing, uploading, downloading) still works, it will not receive new features or major updates.
To get back to the full sync experience, the story suggests upgrading your Mac to at least macOS Mojave (10.14) or higher—though is now the modern standard for new installs. Because Microsoft employs a rolling support window covering
When searching for legacy OneDrive installers from third-party websites, exercise extreme caution. Unofficial downloads may contain malware, spyware, or other security threats. Always verify the source and consider using antivirus software before installation.
Several paid third-party applications offer OneDrive compatibility: This means Let’s Encrypt and other modern SSL
As of this writing, macOS 10.13.6 is significantly older than the current macOS versions. Apple no longer provides security updates for it, and Microsoft has also shifted its support lifecycle. The following write-up reflects the final compatible state of OneDrive for this operating system.