Microsoft cuts M365 Developer storage 416× — from 125 TB ceiling to a 300 GB tenant cap
TL;DR
Microsoft quietly added a storage clause to the M365 Developer FAQ: 300 GB tenant cap, 10 GB/user OneDrive, 0 GB SharePoint in mixed tenants. Versus the old 25 × 5 TB layout, that's roughly a 416× cut.
Microsoft slipped a new storage clause into the Microsoft 365 Developer Program FAQ, with doc metadata stamping the update at February 20, 2026 (Internet Archive captures match Feb or early March). E5 Developer subscribers started seeing "over 300 GB" warnings in the admin console this week.
The rule is blunt:
- Tenant Storage Cap: developer-only tenants are capped at 300 GB pooled storage.
- Zero Additional SharePoint: the Developer SKU contributes 0 GB of SharePoint storage in mixed-license tenants.
- Per-User OneDrive Limit: 10 GB per user on Developer SKU OneDrive.
Against the old setup: the E5 Developer subscription has 25 user licenses, each with 5 TB of OneDrive, a 5 TB tenant cap expandable to 25 TB on request — and the per-user OneDrive math worked out to roughly 125 TB of theoretical headroom. New ceiling: one 300 GB tenant. Roughly a 416× cut at the tenant line, and a 500× cut on per-user OneDrive (5,000 GB → 10 GB).
The target is clear. Chinese community tutorials on "free E5," "unlimited OneDrive," and "personal network drives" all leaned on the same shape — one developer subscription running 25 sub-accounts × 5 TB, used to host media libraries, family file servers, and pirate-share frontends. Microsoft was already reported in January 2025 to be "gradually retiring the M365 E5 Developer Program globally." This update closes the loophole: the subscription stays, 25 licenses stay, but the capacity drops to sandbox-level.
The doc also has a line under-quoted in the coverage: "Microsoft reserves the right to limit the storage on developer subscription licenses." Tenants still inherit the existing short-lived design — Microsoft may force recreation every 90 days; after expiry, only the admin can sign in for 30 days, and on day 60 the subscription and all data are deleted.
If it works for Microsoft, one 300 GB line turns the Developer subscription back into an actual dev sandbox, the hardware-cost ledger clears, and the cloud-storage subsidy gets pulled out of a $10/month SKU. If it doesn't, the next side door to close is the M365 Developer benefit bundled into Visual Studio Enterprise — same 5 TB perk reachable through a different door.
via Microsoft Learn / Sina Tech / CIAOPS
The rule is blunt:
- Tenant Storage Cap: developer-only tenants are capped at 300 GB pooled storage.
- Zero Additional SharePoint: the Developer SKU contributes 0 GB of SharePoint storage in mixed-license tenants.
- Per-User OneDrive Limit: 10 GB per user on Developer SKU OneDrive.
Against the old setup: the E5 Developer subscription has 25 user licenses, each with 5 TB of OneDrive, a 5 TB tenant cap expandable to 25 TB on request — and the per-user OneDrive math worked out to roughly 125 TB of theoretical headroom. New ceiling: one 300 GB tenant. Roughly a 416× cut at the tenant line, and a 500× cut on per-user OneDrive (5,000 GB → 10 GB).
The target is clear. Chinese community tutorials on "free E5," "unlimited OneDrive," and "personal network drives" all leaned on the same shape — one developer subscription running 25 sub-accounts × 5 TB, used to host media libraries, family file servers, and pirate-share frontends. Microsoft was already reported in January 2025 to be "gradually retiring the M365 E5 Developer Program globally." This update closes the loophole: the subscription stays, 25 licenses stay, but the capacity drops to sandbox-level.
The doc also has a line under-quoted in the coverage: "Microsoft reserves the right to limit the storage on developer subscription licenses." Tenants still inherit the existing short-lived design — Microsoft may force recreation every 90 days; after expiry, only the admin can sign in for 30 days, and on day 60 the subscription and all data are deleted.
If it works for Microsoft, one 300 GB line turns the Developer subscription back into an actual dev sandbox, the hardware-cost ledger clears, and the cloud-storage subsidy gets pulled out of a $10/month SKU. If it doesn't, the next side door to close is the M365 Developer benefit bundled into Visual Studio Enterprise — same 5 TB perk reachable through a different door.
via Microsoft Learn / Sina Tech / CIAOPS
