Microsoft is raising OneDrive's supported macOS sync limit from 300,000 items to 1 million, matching Windows, according to The Register. The preview lands in the macOS Insiders ring this month, with general availability slated for June 2027. Eligible devices must meet specified hardware and configuration requirements; others keep the existing 300,000-item cap. Microsoft says the increase is meant to help organizations with large OneDrive and SharePoint libraries sync more content reliably across devices.
The source notes that sync performance may still suffer for large numbers of read-only files or accounts under legal hold. Microsoft says it is actively working to improve performance and reliability for those scenarios. Alongside the limit raise, Copilot gains new abilities: it can analyze across selected files, organize folders, and save repeated workflows as personal skills in Markdown files. A Prompt Gallery offers ready-made prompts, and a new Hero Links feature provides a single, stable URL per file or folder whose permissions can be updated without changing the link. Automatic expiration controls for links are still missing, which organizations requiring time-limited access should weigh before adopting the feature.
Administrators also get a OneDrive Sync command-line tool in private preview. It can pull data from the sync client to report status, troubleshoot policies, diagnose folder backup issues on a single PC, and identify devices across an organization that need attention. The tool includes integration with AI agents, continuing Microsoft's pattern of tying admin and user features to Copilot.