SharePoint Storage Limits: How the Tenant Pool Is Calculated, What Consumes It, and What to Do When It Runs Out

Microsoft's support article for the out-of-storage condition states the formula: every non-education tenant gets 1 TB plus 10 GB per license of an eligible plan, plus any Office 365 Extra File Storage you have bought. The pool is shared by every SharePoint site in the tenant, including the sites behind Microsoft Teams.

Two worked examples:

• 60 users on Microsoft 365 Business Standard: 1 TB plus 600 GB, roughly 1.6 TB.
• 300 users on Microsoft 365 Business Premium: 1 TB plus 3,000 GB, roughly 4 TB.

The number to watch is in the SharePoint admin center under Active sites, where the top right shows storage used across all sites against the subscription total; Microsoft notes the figure excludes the last 24 to 48 hours and is calculated in binary gigabytes. Individual sites can carry their own limits, but a site limit only divides the pool; it never adds to it.

When the total looks wrong, Microsoft's admin center diagnostic (Run Tests: Tenant Storage) shows how the quota was allocated; the usual cause is a license reduction at renewal, since 10 GB leaves the pool with every license that does.

• Version history. Every saved version of a document counts. Microsoft offers automatic version history limits, where the service thins out older intermediate versions, or manual limits with a major-version count between 1 and 50,000 and an expiry of 30 days or more. Older tenants often carry hundreds of versions of large files, and version overhead is routinely the largest line in the storage exports we run.
• Recycle bins. Deleted files sit in the first-stage and then the site collection recycle bin for up to 93 days and count until they expire; Microsoft's Archive pricing article notes that an archived site's billed size changes when items expire from its recycle bin.
• Teams files. Files in a standard channel live in the team's SharePoint site, and each private or shared channel has its own site. All of them draw from the pool.
• Retention. Content under a retention policy or hold is kept after users delete it. Check the Purview policies before expecting cleanup to reclaim space.
• OneDrive is separate. Each user's OneDrive has its own allocation, managed with the OneDrive default storage setting, which is where Microsoft's add-storage article sends OneDrive questions. Moving files there to escape the pool creates a different problem: a departed user's OneDrive is deleted on a schedule.

Measure before deleting. A metadata export of every file and version in scope, never the contents, ranks the drivers: version overhead, large inactive files, media and disk images, duplicates, non-business file types. That is the method behind our SharePoint Storage Optimization engagement.

1. Set version limits tenant-wide. Turn on automatic version history limits for new libraries, then apply limits to the existing libraries with the largest version overhead. Existing versions are removed only when the trim runs; setting the policy alone does not reclaim space.
2. Retire inactive sites. Ownerless and inactive sites accumulate for years; the SharePoint Governance and Information Architecture Review lists them with last activity, owner and size so the decision is a table, not a hunt. SharePoint Advanced Management can automate retirement, but it is separately licensed.
3. Remove non-business content. Installers, disk images, personal media and old backup sets do not belong in a document library; a Teams governance cleanup usually finds a second copy in an abandoned team.
4. Empty recycle bins last, and only after a retention check. Emptying a site collection recycle bin is irreversible for anything not under hold.

What not to do: raise site quotas (the pool is the constraint), or delete versions of contracts or financial records without a compliance sign-off. Native Microsoft 365 Backup is billed per GB protected, so a bloated tenant costs more there too.

When the content is legitimate and active, the answer is capacity. Office 365 Extra File Storage is the add-on that increases the SharePoint pool. From Microsoft's admin documentation:

• It is bought in 1 GB increments, and the quantity can be reduced later to as low as 1 GB; removing the add-on entirely takes a support request.
• It needs an eligible base plan; Microsoft's list includes the Microsoft 365 Business plans, Microsoft 365 E3, E5, F1 and F3, Office 365 E1, E3 and E5, and SharePoint Plan 1 and 2.
• A tenant that buys through a Cloud Solution Provider cannot buy the add-on directly from Microsoft; the order goes through the partner, and ours is at Microsoft's list price with the monthly and annual rows shown on the page.
• It adds storage only: no users, apps, mailboxes or OneDrive capacity.
• It is priced per gigabyte: $0.20 per GB per month on an annual commitment ($2.40 per GB per year), or $0.24 per GB per month on a monthly term, Microsoft list price, October 2026 price list. The quantity is the number of gigabytes, so 500 GB is 500 units: $100.00 per month on the annual term, $1,200.00 per year.

The add-on is the right tool for a working set that is genuinely larger than the pool. It is the wrong tool for a tenant whose pool is two fifths version history; that money buys the same versions again at the next renewal.

Microsoft 365 Archive moves inactive SharePoint sites, and in preview individual files, into a cold tier inside SharePoint. From Microsoft's documentation:

• Archived content stops counting against the active quota, keeps its permissions, metadata and versions, and stays in the Microsoft 365 search index for admin search, Purview and eDiscovery. End-user search results do not show it, and users cannot open it until it is reactivated.
• It is billed pay-as-you-go through an Azure subscription at $0.05 per GB per month, charged only when archived plus active storage exceeds the tenant's licensed SharePoint quota; a tenant under its quota pays nothing for archiving.
• The reactivation fee was removed on March 31, 2025. A reactivated site cannot be archived again for four months; a reactivated file, for 30 days.
• A team with only standard channels archives normally; one with private or shared channels cannot be archived from the SharePoint admin center. File-level archive is still a preview with client limitations.
• Copilot is not trained on archived content, a governance benefit in its own right.

Setup is an Azure subscription, pay-as-you-go billing in the Microsoft 365 admin center, and the Archive toggle under Org settings. As with every Microsoft pay-as-you-go service, the meter is billed to you: we configure it, the consumption is yours.

Most tenants end up with cleanup plus one of the two products (the table below compares them), and the Managed SharePoint Online and Intranet Care Plan watches the pool afterwards so the next email does not arrive on a Tuesday.

Buyers who only need files used to reach for SharePoint (Plan 1) or OneDrive for Business (Plan 1). In January 2026 Microsoft told partners it is retiring the four standalone plans, SharePoint (Plan 1) and (Plan 2) and OneDrive for Business (Plan 1) and (Plan 2): end of sale on 1 June 2026, no renewals from January 2027, with existing subscriptions running to their expiry, and end of service in December 2029 (Microsoft Partner Center announcement of January 2026, via TechRepublic and Petri; see Sources). None of the four is on the October 2026 price list.

For a new user who only needs files, the entry license is now a suite. On the October 2026 price list, annual commitment, Microsoft list price:

• Microsoft 365 Business Basic, $7.00 per user per month ($84.00 per year): SharePoint, a 1 TB OneDrive, a 50 GB mailbox, Teams and the web and mobile apps, and it adds 10 GB to the pool like any eligible license. Business plans stop at 300 users.
• Office 365 E1, $10.00 ($120.00 per year), for tenants above 300 users.
• Microsoft 365 F1, $3.00 ($36.00 per year), or Microsoft 365 F3, $10.00 ($120.00 per year), for frontline workers who open files on a phone; the eligibility rules are in F1 vs F3 vs Business Basic.

If you hold one of the standalone plans, renew it while Microsoft allows and move those users to a suite before the subscription expires; the pool contribution and the OneDrive allocation come with the suite, and the SharePoint (Plan 1) and OneDrive for Business (Plan 1) pages stay on the site for existing subscribers.

Does OneDrive count against the SharePoint storage pool?

Not in a paid tenant. OneDrive is allocated per user; the Extra File Storage add-on does not change it. Only a trial tenant pools SharePoint, OneDrive and Exchange Online together.

Why did our quota drop after renewal?

Because the pool is 1 TB plus 10 GB per eligible license: fewer licenses, smaller pool. Add-on storage is unaffected; run Microsoft's Tenant Storage diagnostic to see the allocation.

Do Microsoft Teams files count?

Yes. Standard-channel files live in the team's site, and every private or shared channel is its own site; all of them draw from the pool.

Is Microsoft 365 Archive cheaper than the add-on?

It depends on how much content is inactive. Archive costs $0.05 per GB per month above the licensed quota, but users cannot open archived content until it is reactivated; the add-on keeps everything live at the list price on our page. Microsoft publishes an Archive pricing calculator; run both numbers.

Will cleanup reclaim space immediately?

No. Deleted items count until the recycle bins purge them (up to 93 days) or an admin empties the bins, version limits reclaim space only when the trim runs, and the admin center figure lags by 24 to 48 hours.

How much does 1,000 GB of Extra File Storage cost?

$2,400.00 per year on an annual commitment, which is $200.00 per month, or $240.00 per month on a monthly term (Microsoft list price, October 2026 price list). Buy it after the version trim, not instead of it.

Can I still buy SharePoint Plan 1 for a file-only user?

Not as a new purchase: Microsoft ended sales of the standalone SharePoint and OneDrive plans on 1 June 2026, and they are not on the October 2026 price list. Microsoft 365 Business Basic at $7.00 per user per month on an annual term is the entry license, and it includes a 1 TB OneDrive and the mailbox.

• Add more SharePoint storage to your subscription — Microsoft Learn, page dated 30 July 2025 (page source read in the MicrosoftDocs GitHub repository), checked 2026-10-11 (1 GB increments, reduction to 1 GB, CSP purchase through the partner, the 24 to 48 hour lag, eligible plans)
• Pricing model for Microsoft 365 Archive — Microsoft Learn, page dated 1 August 2025 (page source read in the MicrosoftDocs GitHub repository), checked 2026-10-11 ($0.05 per GB per month above the licensed quota; reactivation fee eliminated on 31 March 2025; four-month re-archive restriction)
• Overview of Microsoft 365 Archive — Microsoft Learn, page dated 26 June 2025 (page source read in the MicrosoftDocs GitHub repository), checked 2026-10-11 (search, Copilot, private and shared channels, the 30-day file rule)
• Microsoft Learn (support article): SharePoint Online out of storage space (the pool formula and the Tenant Storage diagnostic)
• Microsoft Learn: Set-SPOTenant (version history limit parameters); Delete a user from your organization (OneDrive retention after a user is deleted); Try or buy a Microsoft 365 for business subscription (trial storage limits)
• Microsoft Is Retiring Standalone SharePoint, OneDrive Plans — TechRepublic, January 2026, checked 2026-10-11, and Microsoft Retires Standalone SharePoint Online and OneDrive for Business Plans — Petri, January 2026, checked 2026-10-11 (both quoting the Partner Center announcement: end of sale 1 June 2026, no renewals from January 2027, end of service December 2029)
• Microsoft's US commercial price list, October 2026 (the Extra File Storage, Business Basic, E1, F1 and F3 list prices; the standalone plans do not appear on it)