MC1294528 - OneDrive sync supports up to 1 million items on Windows

Introduction

OneDrive sync on Windows will support syncing up to 1 million items per sync instance per device. This increase is intended to help organizations with large OneDrive and SharePoint libraries sync more content reliably across devices. The capability is planned to be available first in Public Preview (requires the Insiders ring) and later in General Availability.

Devices that do not meet the minimum hardware and configuration requirements will continue to sync at the existing 300,000-item supported limit without disruption.

When this will happen

• Public Preview: We will begin rolling out in late April 2026 and expect to complete by late April 2026.

How this affects your organization

Who is affected

• Users syncing OneDrive (consumer), OneDrive for Business or SharePoint document libraries on Windows
• Users with libraries that approach or exceed the current 300,000-item supported sync limit
• Preview participants using the Insiders ring

What will happen

• Eligible Windows devices can sync up to 1 million items per sync instance.
• Devices that do not meet the requirements remain supported up to 300,000 items with no change in behavior.
• No disruption is expected for existing sync setups.

Note: Performance is not yet optimized for syncing a high volume of read‑only files or for accounts under legal hold. Microsoft is actively working to improve performance and reliability for these scenarios.

What you can do to prepare

No action is required if you do not plan to use Public Preview.

If you plan to evaluate or prepare for this capability:

• Identify devices and users likely to benefit from syncing very large libraries.
• Ensure devices meet the minimum requirements (supported OS, memory, storage, and processor).
• Verify the recommended ideal state configuration for OneDrive and SharePoint sync reliability.
• Inform helpdesk staff and impacted users that Public Preview requires the Insiders ring and that ineligible devices will remain at the current limit.

Learn more: 

• How we release updates through multiple rings - The OneDrive sync app update process | SharePoint in Microsoft 365 | SharePoint | Microsoft Learn
• Recommended sync app configuration | SharePoint in Microsoft 365 | SharePoint | Microsoft Learn
• Restrictions and limitations in OneDrive and SharePoint | Other issues | Troubleshoot | OneDrive | Microsoft Support

Compliance considerations

No compliance considerations identified. Review as appropriate for your organization.