---
source_url: "https://mc.merill.net/message/MC1294528"
title: "MC1294528 - OneDrive sync supports up to 1 million items on Windows | Microsoft 365 Message Center Archive"
mirrored_at: 2026-08-16T01:33:14.268Z
host: mc.merill.net
cited_in_42a: true
mirror_canonical: "https://index.42a.ai/mc.merill.net/message/MC1294528"
---

> **Original source:** https://mc.merill.net/message/MC1294528

****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](https://support.microsoft.com/office/restrictions-and-limitations-in-onedrive-and-sharepoint-64883a5d-228e-48f5-b3d2-eb39e07630fa#numberitemscanbesynced) (supported OS, memory, storage, and processor).
-   Verify the recommended [ideal state configuration](https://learn.microsoft.com/sharepoint/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](https://learn.microsoft.com/sharepoint/sync-client-update-process#how-we-release-updates-through-multiple-rings)
-   [Recommended sync app configuration | SharePoint in Microsoft 365 | SharePoint | Microsoft Learn](https://learn.microsoft.com/sharepoint/ideal-state-configuration)
-   [Restrictions and limitations in OneDrive and SharePoint | Other issues | Troubleshoot | OneDrive | Microsoft Support](https://support.microsoft.com/office/restrictions-and-limitations-in-onedrive-and-sharepoint-64883a5d-228e-48f5-b3d2-eb39e07630fa)

****Compliance considerations****

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