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October preview raises supported limit from 300,000 items, with general availability penciled in for June 2027

Microsoft is raising OneDrive's supported macOS sync limit to one million items, matching Windows, alongside new Copilot features, sharing controls, and an admin command-line tool.

The macOS preview is scheduled for the Insiders ring this month, with general availability targeted for June 2027. Eligible devices must meet hardware and configuration requirements; others retain the existing 300,000-item supported limit.

"This increase is intended to help organizations with large OneDrive and SharePoint libraries sync more content reliably across devices," Microsoft said.

However, sync performance may suffer for large numbers of read-only files or accounts under legal hold. "We are actively working to improve performance and reliability for these scenarios," Microsoft said.

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