OneDrive: Sync support for up to 1 million items on macOS
OneDrive Sync supports syncing up to 1 million items on macOS devices, helping teams manage large document libraries and shared content at scale without compromising access across devices. This preview requires the Insiders ring and that devices meet minimum hardware and configur
DIGITAL SKILL WORKS LTD / 12 PANES
What it is
OneDrive: Sync support for up to 1 million items on macOS is a Microsoft 365 roadmap item published via Microsoft Release Communications. Current status: In development.
What it does
OneDrive Sync supports syncing up to 1 million items on macOS devices, helping teams manage large document libraries and shared content at scale without compromising access across devices. This preview requires the Insiders ring and that devices meet minimum hardware and configuration requirements. Devices that don't meet these requirements continue to sync at the existing 300,000-item supported limit with no disruption.
Why you should care
Board
Security/compliance control — fund Steady before more seats.
CISO
Prioritise as Steady control; wire into IR and GRC evidence paths.
CFO
Map licence or consumption impact to the frozen value case; avoid seat spray.
Adoption
Pilot with a named cohort and measure changed work, not vanity clicks.
Suggested action
Wave 0 first: Security → GRC → Cost & Value → Licence → Adoption. Add to Horizon watchlist with an owner. Pilot only after Steady controls for the affected surface are in place.
12 Panes: 03 Horizon
Communication needed
- Security: Assess exposure, Conditional Access, and agent/tool permissions.
- GRC: Update AI/agent register and evidence path; confirm DPIA triggers if personal data is in scope.
- FinOps: Forecast seat or credit impact; align to frozen value case.
- Adoption: Plan cohort messaging, clinics, and success measures.
- Comms: One story for board and staff — what changes, what does not, who owns risk.
Benefits
- May improve productivity on a specific Microsoft 365 surface when permissions and data quality allow.
- Roadmap visibility helps Horizon planning without guessing dates.
Risks
- Status and dates change; treat MRC as directional, not a contract.
- Enabling without Steady controls can amplify overshare or cost leakage.
- Preview or rolling features can change behaviour; fence exploration on Pane 12 Frontier.
Source
- MRC id: 570448
- Status: In development
- Products: OneDrive
- GA / disclosure: June CY2027
- Preview: October CY2026
- Platforms: Mac
- Cloud instances: Worldwide (Standard Multi-Tenant), GCC, GCC High, DoD
- moreInfoUrls: —
- Open on Microsoft 365 Roadmap
Microsoft Release Communications / Microsoft 365 Roadmap (AI at Work). Content is subject to Microsoft API Terms of Use. Dates and status change; verify in the official roadmap before acting.