OneDrive storage quotas and limits

OneDrive's storage model has a few moving pieces — per-user quotas, the tenant's overall capacity, and the rules for getting more than the headline 1 TB. Knowing them avoids unwelcome surprises.

Default per-user quotas

• Microsoft 365 Apps for Business and most Microsoft 365 plans: 1 TB per user.
• Microsoft 365 E3 / E5: starts at 1 TB, can be expanded.
• Microsoft 365 F1 / F3 (frontline): 2 GB.
• Education plans: vary by tier.

The quota is set by the admin in the SharePoint admin center under OneDrive → Storage, with a default applied to new users and the option to override per user.

Expanding beyond 1 TB

For plans that support it, Microsoft expands per-user storage up to 5 TB by default if a user's OneDrive crosses 90% utilisation. Beyond 5 TB, an admin must request additional quota through Microsoft support, providing usage justification. Microsoft can grant up to 25 TB per user for E3/E5 customers.

For unique requirements — media production, scientific data, video archives — Microsoft's typical answer is: keep the largest assets in Azure Blob storage or another purpose-built service, not OneDrive.

File-size and sync limits

• Single file size: up to 250 GB is supported.
• File path length: up to 400 characters for the full URL (server + library + folders + filename).
• Filename characters: ?<>:"|*/\ are still illegal, plus a few reserved names.
• Item count: a single OneDrive can hold up to 300,000 items with good performance; sync clients may slow above that.

Tenant-wide storage

Each tenant has a tenant storage pool calculated as 1 TB plus 10 GB per licensed user, shared across SharePoint. OneDrive storage is separate from the SharePoint pool — it's per-user. Tenants typically buy additional storage at the per-GB/month rate when SharePoint nears its pool, not when OneDrives fill up.

Retention and deleted content

• First-stage recycle bin: 93 days for deleted items.
• Second-stage recycle bin: extends retention up to the site quota.
• Preservation hold libraries (driven by Purview retention) keep content indefinitely against the OneDrive's quota — they can quietly inflate usage.

Watch preservation hold size in reports — it's where unexpected OneDrive fullness usually comes from.

Monitoring

The OneDrive section of the admin center reports active vs total storage, top consumers, and growth trends. Set alerts at 80% to avoid users hitting walls.