Microsoft 365 Local vs self-hosted open source

The cost comes from several components, and they are paid to different parties. Microsoft 365 Local is priced through Microsoft licensing plus the Azure Local hardware and operations underneath it. A self-hosted stack adds the hardware or cloud capacity you provision, the Kubernetes platform, storage, backup, email delivery, the open-source software itself (free to download), and the people who install, operate and upgrade it. One-time costs include design, initial deployment, data migration and integration with your identity provider. Recurring costs include hardware refresh, storage growth, staff time for upgrades, monitoring, backups, and any enterprise subscription. Ask every quote to separate these lines and to state which costs depend on user count, storage volume and the number of environments (production, test and disaster recovery).

Some teams can, but it depends on existing Kubernetes, identity and storage skills. openDesk is deployed with Helmfile and Helm onto a CNCF-certified Kubernetes cluster at v1.33 or later, and it needs an ingress controller, cert-manager, an RWO volume provisioner and production services such as PostgreSQL 15, MariaDB 10, Redis 7, an SMTP relay, ClamAV over ICAP, object storage and a TURN server. A Nextcloud deployment is smaller in scope but still needs database, caching, backup and upgrade discipline. Nextcloud does not allow skipping major releases, so upgrades must follow a planned sequence with backups first. Assess your team against this list, then decide which parts to keep in-house and which to scope as a fixed-scope engagement or a retainer for upgrades and support.

The duration depends on the workloads, data volume and the number of users, not on a fixed formula. Mailboxes, files, SharePoint or OneDrive content, calendars and chat each move differently, and each needs its own export format, mapping and validation. Timeline drivers include the total data volume, the number of identity and group mappings, how much custom integration exists, whether a pilot group runs first, and how long your change process takes to approve cutovers. Export constraints also matter: Purview eDiscovery search export packages expire 14 days after creation, and exporting requires an E3 or E5 license. Ask any provider for a phased plan with named milestones and acceptance criteria rather than a single overall duration.

Not always, but production requirements usually push organizations toward a paid tier. The Nextcloud server is licensed under AGPL-3.0 and free to self-host, while Nextcloud GmbH sells Standard, Premium and Ultimate subscriptions with a 100-user minimum, adding support, maintenance periods and extended features. ZenDiS recommends openDesk Enterprise Edition for production. It uses the same open-source core licenses but adds closed-source modules and SLA-backed 2nd and 3rd level support. Open-Xchange states that certain modules may be subject to separate fees in the license agreement. Confirm with each vendor which features and support levels your production obligations require, and price the subscription as a recurring line in your comparison.

In every self-hosted option, your organization or its service partner owns patching, which is a key difference from a cloud service where the provider handles the platform. openDesk releases follow an annual major, monthly minor and on-demand patch cadence, and only the latest minor version is supported. Nextcloud publishes a major every four months and supports each for one year with monthly maintenance releases. OX App Suite LTS releases are supported until the next LTS release plus six months. Enterprise tiers may add signed or enterprise-only security patches, so confirm that detail in writing. Build a patch calendar that covers the operating system, Kubernetes, databases and every application component, and assign an owner for each.

A DeployOpen quote follows from a written scope, and most engagements are fixed-scope with scope, deliverables and timelines agreed in writing before work starts. Ask the quote to list the workloads in scope, such as mail, files, office editing, chat or video, and the number of users and environments. It should name the target platform (openDesk or the Nextcloud stack), the identity integration, the data migration method and the acceptance criteria for each phase. Request an explicit list of what is excluded, such as third-party licenses, Microsoft licensing, hardware and cloud capacity, and ongoing support. Ask whether upgrades, backups, testing and documentation are included, and what a retainer covers after go-live. DeployOpen does not publish a price list, so compare quotes on the written scope.

Yes, the hardware and hosting model affects both one-time and recurring cost, so compare it explicitly. Microsoft 365 Local runs on Azure Local infrastructure that you supply and maintain, while openDesk needs a Kubernetes cluster and production services that you must size. An openDesk evaluation deployment starts at 12 x64 CPU cores, 32 GB of RAM and more than 10 GB of disk, and production sizing is far larger and depends on users and workloads, so confirm sizing with the vendor and your own testing. ARM is not supported yet. Ask for a sizing assumption for each user tier, the storage growth rate you planned for, and the cost of a disaster recovery site.

Start by confirming the lifecycle of the product you run today, because it sets your timing. Exchange Server 2019 reached the end of its extended support in October 2025, and Microsoft points customers to Exchange Server Subscription Edition or Exchange Online. Exchange Server SE follows the Modern Lifecycle Policy with no fixed end date provided configurations stay current. Compare the costs of staying on a supported Microsoft path, moving to a self-hosted mail platform such as OX App Suite, and the migration effort for each. Include the cost of keeping old servers patched, the eDiscovery and archival needs you must still meet, and the internal time needed to run either path.