About OneDrive
The Microsoft 365 file layer that also catches every Teams attachment.
OneDrive started as Windows Live Folders in 2007, became SkyDrive later that year, and was renamed OneDrive in 2014 after a trademark dispute with British broadcaster BSkyB. Today it ships as part of Microsoft 365 in two distinct flavours: OneDrive (consumer, tied to a Microsoft account) and OneDrive for Business, which is a per-user SharePoint site under the hood. Tight Office integration, Teams chat-attachments that quietly save to the sender's OneDrive, and Outlook attachments that can be sent as OneDrive links make it the default file layer for most Microsoft-stack tenants.
What makes OneDrive interesting to report on is exactly what makes it slippery to govern by hand. The Microsoft Graph API exposes drives, items, permissions, sharing links, versions and activity, and on a real tenant that surface is enormous. The admin centre shows quota and a per-user activity report. The harder questions, like which OneDrive accounts belong to leavers and still hold the only copy of an important deck, how external sharing has grown since the last Teams guest wave, or which files are duplicated across OneDrive and a SharePoint team site, sit between OneDrive, Microsoft 365 audit logs and Entra ID. Pulling OneDrive into a warehouse is how IT and compliance answer those questions on a schedule instead of hunting through the Graph one user at a time.