M365 SharePoint & OneDrive | Web search

Search in SharePoint Online and OneDrive on the web is getting a new interface. According to MC1540513 from November 5, 2026, it will move to Microsoft 365’s shared Copilot search interface: natural language input, AI-generated summaries with source references, and filters in a single view.

Some AI features depend on the license. The message does not specify which ones.

The Frontier Preview has been running since mid-October 2026 and is scheduled to end in mid-January 2027. General availability will begin in mid-January 2027 and is expected to be completed by mid-April 2027. The "Act by" date mentioned in the announcement is January 18, 2027. The associated roadmap entry is 573696.

Microsoft does not anticipate significant deployment effort but recommends testing custom search interfaces and integrations. This primarily affects tenants with customized search pages, search result web parts, or solutions that rely on the previous behavior of SharePoint search.

Those who need more time can revert to the old interface at both the tenant and site levels. During the Frontier Preview, there is also an opt-out for users missing a critical search feature. The names and locations of these switches are not specified in the announcement. Microsoft has promised new documentation before general availability.

Copilot only displays content that the user has at least read access to. This is why AI summaries reveal what permissions allow. Hardly anyone reads through a classic hit list of 300 files. But everyone reads a summary that quotes three payroll lists. The notification itself does not change the permissions—it just makes existing shares more noticeable.

Anyone who has been putting off addressing oversharing should use the time until January to review widely open sites. The Data Access Governance reports in the SharePoint Admin Center, for example, show sites with 'Everyone except external users' in the 'Site permissions across your organization' snapshot.

The reports can be fully utilized with SharePoint Advanced Management, which tenants automatically receive when at least one Microsoft 365 Copilot license is assigned. With E5 alone, the snapshot reports are missing, and the activity reports are limited to 10,000 sites.

For most tenants, the switch is a announced UI change. Effort arises with custom search solutions and permissions. Test adjusted search pages in the preview, clarify whether you need to roll back the switch for individual sites, and check sites with 'Everyone except external users' before January 18.