Access Witness

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Access Witness is self-hosted software for investigating SharePoint Online permission history. It runs on the customer's Windows Server, stores recorded history in the customer's SQL Server, and helps reconstruct historical effective SharePoint authorization from collected evidence: who had access to a site, library, folder or file on a recorded date, how they got it (directly, through SharePoint, Microsoft 365 or nested Entra ID groups, or through sharing links) and what changed. When the records are not enough to confirm an answer, it shows the limits. History starts with each site's first full scan. It reads SharePoint permissions without changing them. Made by NATHELVO TECHNOLOGIES INC.; not affiliated with Microsoft.