A file server built in 2012 was never designed to live in the cloud. It has drive letters, mapped shares, and folder permissions inherited from people who left the company years ago. When enterprises try to migrate file server content into Microsoft 365 using basic copy paste logic, they inherit all of that mess along with the files. Tzunami has spent over two decades solving exactly this problem, and its approach starts from a simple premise: structure has to survive the move, not just the data.
Legacy file shares are still everywhere. IDC estimated back in 2021 that unstructured data, the kind sitting on file servers, was growing at roughly 25 percent annually inside large enterprises, far outpacing structured database growth. That volume doesn't disappear when a company adopts Microsoft 365. It just becomes a liability sitting on aging hardware that IT keeps patching instead of retiring.
The Real Cost Of Ignoring Legacy Systems
Every year a company delays a proper migration, the file server becomes riskier to touch. Permissions drift. Nobody remembers why a folder was locked down in 2015. When the eventual move happens, teams often reach for a generic file migration tool that simply copies bytes without preserving the logic behind them. That's how organizations end up with a SharePoint instance that looks like a dumping ground six months after going live.
Tzunami built its Deployer platform specifically to avoid that outcome. Rather than treating a file server as a flat collection of documents, it maps folder hierarchies, security groups, and metadata before migration begins, then replicates that structure inside SharePoint or Microsoft 365 rather than flattening it. That distinction, mapping before moving, is the single biggest predictor of whether a migration finishes clean or finishes in a support queue.
Here's a sentence worth keeping: a migration that ignores structure isn't a migration, it's a data dump with a deadline.
Open Text Content Server Migrations Need A Different Playbook
Migrating out of an Open Text Content Server environment is a different animal entirely from a standard file share move. OpenText systems typically carry decades of records management rules, retention schedules, and compound document relationships that a basic copy tool has no way of interpreting. Organizations running OpenText Content Server since the early 2000s often have millions of objects with custom metadata fields baked into legal and compliance workflows.
Tzunami has supported OpenText migrations for years precisely because these environments punish shortcuts. Its platform reads the native OpenText object model directly, rather than exporting to a generic intermediate format that loses relationships along the way. For regulated industries like finance, healthcare, and legal services, that fidelity isn't a nice to have. It's the difference between passing an audit and failing one.
Picking A Migration Suite For SharePoint That Actually Scales
Enterprises comparing a migration suite for SharePoint usually land on a short list of familiar names: ShareGate, AvePoint, and Tzunami among them. ShareGate and AvePoint both do strong work on SharePoint to SharePoint or Microsoft to Microsoft transfers, and they're widely used for good reason. But when the source system predates SharePoint entirely, think file servers, OpenText, Documentum, or Lotus Notes, Tzunami's Deployer tends to be the tool enterprise IT teams reach for instead, since it was built from the ground up to handle non native source formats.
Microsoft itself has confirmed that SharePoint Online supports single files up to 250GB and site collections up to 25TB as of its most recent platform updates. Those limits sound generous, but they mean nothing if the migration tool can't correctly map a decade of nested folder permissions into SharePoint's flatter, list based architecture first.
What A Clean File Server To SharePoint Online Move Looks Like
A well planned move to* migrate file server to SharePoint Online *happens in phases, not in a single weekend cutover. Departments get migrated one at a time, validated, then adjusted before the next group moves. That phased cadence catches structural problems early instead of surfacing them across an entire organization at once.
Tzunami's platform was built around this incremental model, letting IT teams pilot a single department, confirm permissions and metadata landed correctly, then scale the same mapping logic across the rest of the file server. It's a slower start, admittedly, but it avoids the chaos of a big bang migration that breaks links across every team simultaneously.
The organizations that get this right treat the file server not as a burden to eliminate quickly, but as an asset worth mapping carefully before it moves anywhere. Speed without structure just relocates the problem into a more expensive platform.
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