Since February 2026, Microsoft offers Microsoft 365 Local in a fully disconnected mode: Exchange Server, SharePoint Server and Skype for Business Server can run entirely in your datacenter, without Internet access. The idea is simple: keep the familiar M365 suite experience on server building blocks… but without relying on the public cloud. It shifts you from mass-produced cloud convenience to digital craftsmanship you control.
It's designed for B2B organizations with strict constraints: manufacturing, defense, healthcare, finance, government, or any SME selling to enterprise customers that demand sovereignty and rock-solid operational continuity. And if you look at AI closely: Foundry Local also enables local AI inference (GPU L4/L40/L40s, RTX 6000 Blackwell), still without Internet.
The SME Opportunity
The business benefit is concrete: your critical services stay on your premises. Email, document sharing, internal communications — everything keeps running even if you lose Internet connectivity, your VPN fails, or your security policy forbids outbound traffic.
- Control of sensitive data: no transit to a public cloud. Easier to justify and audit for customers and regulators.
- Operational continuity: an isolated site, an industrial zone, or a restricted network environment — you no longer depend on an Internet link to run the office.
- Pragmatic sovereignty: for Luxembourg/France/Switzerland requirements, it removes many hosting gray areas.
- Less hyperscaler lock-in: architecture is controlled on-prem, with monthly offline updates. Support is announced through 2035.
Note: Microsoft positions Azure Local (formerly Azure Stack HCI) in the same "disconnected" spirit. In practice, you can build a modernized local platform without having to open the floodgates to the Internet.
Key Considerations
"Offline by design" has a cost, and not only on the invoice.
- CapEx and hardware prerequisites: minimum 3 nodes, 96 GB RAM per node, 24 cores, 2 TB SSD per node. For an SME, the entry level quickly becomes a full infrastructure project.
- Limited partners: deployment goes through Azure Local Premier partners, announced so far as Lenovo (TruScale) and HPE (GreenLake). Less competition means less negotiation leverage.
- Functional regressions: Teams is not included — this package uses Skype for Business Server. For modern collaboration (channels, apps, integrations) this can feel like a step back.
- Extraterritorial/legal: even disconnected, the product remains a Microsoft product. Depending on your constraints, this still needs contractual handling and risk analysis.
- Contract: an MCA-E is required (plan this with procurement/IT).
Compliance Considerations
GDPR / nLPD: the benefit is clear if your goal is to minimize transfers and keep data within your sovereign perimeter. In disconnected mode, data stays internal and monthly offline updates strengthen operational autonomy.
AI Act (if Foundry Local): if you enable local AI inference, plan an audit at deployment: classify use cases, define transparency requirements, set model governance, and ensure traceability. It's not blocking, but it must be framed from day one.
Conclusion & Cohesium Support
Microsoft 365 Local answers a very practical question many leaders ask: how to keep the M365 experience while regaining control of data and availability? For some SMEs it is the missing link. For others, it may be an expensive over-investment where a well-chosen sovereign hosting option would suffice.
Rather than cobbling a solution together, Cohesium AI can support you with a concrete, craftsmanship-focused approach:
- Governance & sovereignty audit (GDPR/nLPD): data mapping, customer requirements, risk analysis, and a clear demarcation of what must remain on-prem vs what can leave.
- Architecture selection support: trade-offs between on-prem and local alternatives (e.g., Exoscale, Infomaniak, OVHcloud, Scaleway) based on availability, budget, and operational model.
- Technical ROI benchmark: Azure Local vs open alternatives (local Kubernetes, OpenStack) with a cost/risk/skillset lens.
- If Foundry Local: AI roadmap audit, governance, and team upskilling for a "local-first" mindset.
Contact us to discuss custom integrations or strategic audits