Microsoft cloud
OneDrive
OneDrive for Business
OneDrive for Business is Microsoft's cloud file storage and synchronisation service for individual users within Microsoft 365, distinct from the consumer OneDrive service despite sharing a name and client application.
Why OneDrive matters in a Microsoft estate
OneDrive matters because Microsoft 365, Azure, Windows 365, Teams, and related services are usually managed as one estate. The term connects to planning, cost, configuration, security, and day-two operational decisions across that estate.
How OneDrive shows up in practice
It is built on the same underlying SharePoint Online storage infrastructure that also powers Teams file storage and SharePoint document libraries. This means OneDrive is more accurately understood as an automatically provisioned personal SharePoint site per user than as a genuinely separate storage product. Each licensed user gets a dedicated storage allocation, 1TB by default on most Microsoft 365 business and enterprise SKUs, with the ability to pool additional storage from unused licences in the tenant up to a much higher cap. Files sync bidirectionally between the cloud and local devices through the OneDrive sync client.
This client also handles Known Folder Move, a widely deployed configuration that redirects a user's Desktop, Documents, and Pictures folders into OneDrive automatically, so that files saved locally are backed up and available across devices without the user needing to deliberately save into a OneDrive folder. This local-cloud sync relationship is also where the most common OneDrive support issues originate: sync conflicts when the same file is edited offline on two devices, and sync client errors from file paths exceeding Windows length limits. Another common source of confusion is the difference between a file being "available offline" (fully downloaded locally) and using Files On-Demand, which shows a file in Explorer without it actually being downloaded until opened.
This distinction trips up users troubleshooting why a file appears present but will not open without an internet connection. Externally, OneDrive is the mechanism behind most individual file and folder sharing links sent out of a Microsoft 365 tenant. Sharing defaults (anyone with the link, versus specific people, versus organisation-only) are configured at the tenant level in the SharePoint admin center but can be further restricted per site.
Uncontrolled default sharing settings are therefore a recurring data governance and compliance exposure, since a permissive tenant default can result in sensitive files being shared far more broadly than a user intended, often without them realising the org-wide default was set to allow it. From a Windows 365 and Azure Virtual Desktop perspective, OneDrive interacts directly with Cloud PC and session host design. Because Cloud PCs and multi-session hosts are effectively disposable or shared compute, OneDrive with Known Folder Move redirection is a standard part of ensuring a user's files persist correctly across a Cloud PC resize, a reprovision, or a shared session host where the user's profile is not guaranteed to be the same machine session to session.