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Moving between Azure DevOps organizations or tenants? This guide covers moves, merges, and splits, what migrates, your options, and the five stages to run it. OpsHub Migrator for Microsoft Azure DevOps (OM4ADO) supports it with history, user identity mapping across tenants, and delta migration, so teams keep working.
Teams leaving TFS must move years of work items, TFVC history, links, and users to Azure DevOps Services without stopping delivery. Microsoft’s Data Migration Tool needs an upgrade to a recent Azure DevOps Server release first, and moves the whole collection in one lift and shift. OpsHub Migrator for Microsoft Azure DevOps (OM4ADO), co-developed with Microsoft, reads TFS and Azure DevOps Server versions 2010 through 2022 directly, with no upgrade. It is UI-based with no code, migrates the projects you choose in phases, keeps full history and fidelity, and its delta sync lets teams keep working. Its Free edition has no license key.
Teams move off TFS for three main reasons:
A TFS migration is harder than copying files, because a project is years of connected data. When it goes wrong, the cost is delayed delivery, lost traceability, and broken access. These are the risks that make it hard:
To see how these problems appear in real migrations and how teams fix them, read common pitfalls in Azure DevOps migrations and how to avoid them.
| Option | Best for | Key points |
|---|---|---|
| Microsoft native Data Migration Tool | A one-time, full-collection move to Azure DevOps Services |
|
| OM4ADO | Phased, selective, consolidation, or large migrations |
|
| Planview Hub | Connecting and syncing data across many ALM and Agile tools |
|
| CSV import and export | Very small work item moves and backlog cleanup |
|
For a full side-by-side comparison of every tool, read best Azure DevOps migration solutions in 2026.
| Data item | How it migrates |
|---|---|
| Work items | All types, standard and custom, with full revision history and comments |
| Attachments and media | Attachments, inline images, and user mentions |
| Links | Work item relationships and changeset-to-work-item links |
| TFVC source code | Changesets with their full version history |
| Changeset labels | Migrated with the changesets they mark |
| Test assets | Test plans, suites, and runs |
| Pipelines | Build and release pipeline configurations |
| Dashboards and queries | Queries, dashboards, and widgets |
| Area and iteration | Paths and their hierarchy |
| Users | Users, teams, and groups |
| Git repositories | Repositories with their history |
A custom field with no match in the target needs a home before the run, or its data has nowhere to go. For the pipeline layer, including what you must rebuild by hand, read how to migrate builds, releases, and pipelines in Azure DevOps.
Try OM4ADO Free and move TFS work items, history, comments, attachments and TFVC changesets to Azure DevOps.
The migration follows five steps. The same five work for one small project or a full estate.
Decide which projects move and how far back their history must go, and pick your target: Azure DevOps Services, or a newer Azure DevOps Server release if you must stay on-premises. Size the work before you choose an edition. The Data Discovery Utility is a read-only scan of your source that counts work items, revisions, and changesets, so the numbers guide the plan. Settle the repository question now too, because OM4ADO moves TFVC as TFVC with its history, and moving to Git is a separate decision.
Confirm your version, then prepare the source and the people. Back up your TFS databases, and test that the backup restores. Create or invite each user in the target organization before the run, or the migrated work shows the migrating account as the author instead of the real person. Set access tokens so the source can be read and the target can be written to. Pre-migration checks flag source data issues early, so you fix them before the full run. The TFS to Azure DevOps migration video shows the setup and run on screen.
Connect the source and target, and test the connection before you start, because a connection that drops mid-run wastes more time than the test takes. Run a pilot on one real project first. Then run the full migration, which moves the historical data. After that, delta sync copies only what changed since the last run, so teams keep working while it catches up. If one item fails, OM4ADO logs it and continues, and the run resumes from the last checkpoint once you fix the cause.
Run one last delta sync close to the switch. Because the history already moved, this final sync is small and quick. Announce the switch, freeze the last changes, and move teams to Azure DevOps, so cutover is a short planned event rather than a long outage. Then repoint Visual Studio connections, build agents, and service connections at the new organization. OpsHub and infiNetix ran a TFS to Azure DevOps migration under a tight deadline with no downtime this way.
Check the result in two passes. First, compare counts: source work items against target, and source changesets against target. Second, open individual work items of different types, and compare their history, comments, attachments, and links against the source, because a count alone misses a link that still points at the old server. Confirm permissions, pipelines, and agents work. Keep the source read-only until each team signs off, then retire it. CSI Leasing validated its TFS to Azure DevOps move this way.
For the full pre-migration and go-live list, follow the Azure DevOps migration checklist.
To migrate from TFS to Azure DevOps in 2026, you scope what moves, assess the source and the people, migrate in a pilot and then for real, cut over, and validate the result. Every TFS and Azure DevOps Server version from 2010 to 2022 migrates directly to Azure DevOps Services, with no prior upgrade.
OM4ADO is co-developed with Microsoft and has been used to migrate more than 2 billion work item revisions. It reads TFS 2010 through 2022 directly, runs through a user interface with no code, and moves the projects you select in phases with full revision history. Its delta sync lets teams keep working, so there is no development freeze, and its Free edition has no license key. For a plan mapped to your own TFS environment, book a slot with a migration engineer.
With OM4ADO you can migrate directly, because it reads TFS and Azure DevOps Server versions 2010 through 2022 as sources. Microsoft’s Data Migration Tool needs the source on one of the two most recent Azure DevOps Server releases, so older servers must upgrade first.
Yes. OM4ADO moves only the projects you select, and the rest of the collection stays where it is. Microsoft’s tool moves one whole collection into one new organization, with no way to pick single projects.
The OM4ADO Free edition migrates from TFS or Azure DevOps Server to Azure DevOps Services at no cost and with no license key, up to 1,000 work items and 1,000 TFVC changesets. The run stops once it reaches that limit. The Pro edition removes the limit and adds data such as test plans, pipelines, dashboards, area and iteration paths, and user groups.
The time depends on data volume, mainly revisions, changesets, and attachments, so a fixed number without seeing your data would be a guess. With OM4ADO, delta sync moves the history ahead of time and teams keep working, so you do not need a development freeze. Only the short cutover is planned downtime.
With OM4ADO, yes. You can run it, widen the scope, and run again without deleting what already moved. Microsoft’s tool allows one production run per collection, so a mistake there means starting over.
OM4ADO logs the failed item and keeps the run going, so one problem does not stop everything. Once you fix the cause, the migration resumes from the last checkpoint. A pilot run finds most causes before the production run.
Yes, with OM4ADO. It can bring several source collections into one Azure DevOps organization. The full method is in the guide to merging multiple Azure DevOps or TFS instances.
Get OM4ADO free and start your TFS to ADO migration
Bring your Azure DevOps setup and talk through the mapping and a pilot plan.
