Most teams start shopping for SharePoint migration tools before they know what they are migrating. It feels like the logical first move, since the tool is the visible, purchasable part of the project. But the tool is only as good as the decisions behind it, and those decisions are usually unmade when the demos begin. The result is a familiar pattern: a pilot that goes smoothly on tidy folders, followed by a production run that stalls on long file paths, orphaned permissions, and metadata nobody mapped.
This article walks through the sequence that tends to work better. It starts with understanding the content, moves to the features that separate one tool from another, and ends with the practical realities of moving into Microsoft 365.
Start With a SharePoint Migration Assessment
A SharePoint migration assessment is the inventory-and-risk exercise that happens before any content moves. Done properly, it turns a vague sense of scale into a list of specific problems.
The inventory comes first: how many sites, libraries, and items exist, how big they are, and how old. Last-modified dates are the most useful single field. In most mature environments, a large portion of content has not been opened in years, and it is cheaper to archive or delete it than to migrate it. Teams that skip this step pay for the transfer, then pay again for storage and search noise in the new tenant.
Next comes the list of things SharePoint Online will not accept as-is. File paths are capped at 400 characters, and deeply nested folder structures from file shares often exceed that. Certain characters and trailing spaces in names are rejected, and some file types are blocked. Individual files above 250 GB will not upload. These issues are easy to fix in bulk before migration and tedious to fix one by one after a failed batch.
Customizations deserve their own review. Farm solutions, InfoPath forms, and SharePoint 2010 and 2013 workflows do not move to SharePoint Online. They need to be rebuilt, often in Power Apps or Power Automate, or retired. Microsoft has also ended support for older on-premises releases, with SharePoint 2013 out of support since April 2023 and the 2016 and 2019 versions following in 2026, which gives many organizations a firm deadline in place of a preference.
Finally, look at permissions. Broken inheritance, nested groups, and accounts belonging to people who left years ago are normal in long-running environments. Mapping them to Microsoft Entra ID is among the most error-prone parts of any project, and the assessment should produce a list of identities that need resolving before cutover.
What to Look For in a SharePoint Data Migration Tool
Once the assessment is done, requirements become concrete, and a SharePoint data migration tool can be judged against them rather than against a feature checklist.
Metadata and version fidelity
If your content carries custom properties, such as contract numbers, document classes, or review status, the tool needs a mapping interface flexible enough to transform values, handle multi-value fields, and populate managed metadata terms. It also needs a clear policy on versions. Migrating every version is slow and inflates storage. Migrating only the latest loses audit history. Good tools let you choose per project, or per library.
Permissions and identity handling
Check how the tool resolves users and groups from the source to Entra ID, what it does with unresolved accounts, and whether it can preserve unique permissions without flattening everything. Ask to see this working on a messy sample, not a demonstration set built to look clean.
Incremental runs and reporting
Large migrations are never a single event. Users keep working in the old system until cutover, so the tool must support delta passes that pick up only what changed. It should also produce item-level logs that let you reconcile source and destination. A migration you cannot verify is a migration you cannot sign off.
Link and reference handling
Documents often contain links to other documents, and sites contain links to pages that no longer exist after the move. Tools differ widely in whether they rewrite those references. Discovering the gap after go-live is one of the quicker ways to lose user trust.
Planning a SharePoint Migration Cloud Move
A SharePoint migration cloud project adds constraints that on-premises-to-on-premises moves never face. The most important is throttling. Microsoft 365 limits how fast data can be written to a tenant, and those limits tighten when many requests arrive at once. A tool that ignores them will see retries and failures. A tool that respects them will take longer than your bandwidth alone suggests, so schedule large batches outside business hours and build the timeline around real throughput, not theoretical speeds.
Most serious tools use Microsoft's Migration API, which stages content in Azure storage and imports it in bulk, and this is considerably faster than writing items one at a time through the standard APIs. Confirm that the tool you are evaluating uses it, and whether it needs a staging account you control or one it manages for you.
So, Which Is the Best SharePoint Migration Tool?
People searching for the best SharePoint migration tool want a single name, and a single name would be misleading. The right choice depends on the source system, the volume, the metadata complexity, the compliance requirements, and the skills available in-house. Microsoft's free tools are often the best choice for a straightforward file share move. A migration from a document management system with custom object types, deep version trees, and layered security usually justifies something more specialized.
When the source is an enterprise content platform rather than a file server, vendors that focus on SharePoint content migration, Tzunami's approach to SharePoint content migration being one example, tend to be built around the structural problems those moves create. The practical test is the same whichever product you consider: run it against a representative sample, including your worst folders and your oddest permissions, and see what it reports back.
Cost should be weighed against the effort it removes. A license that saves two weeks of manual remediation and re-runs may be cheaper than a free tool that needs a consultant to babysit it.
Making the Decision Stick
Tool selection works best when it comes late. Run the assessment, clean what you can, define how metadata, versions, and permissions will be handled, and write those rules down. Then test two or three candidates against the same pilot content and compare the logs, not the marketing.
What teams remember afterward is rarely the interface of the tool they used. It is whether the numbers matched on the day they switched off the old system, and whether the people who rely on the content found it where they expected. A tool chosen against that standard rarely disappoints.
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