SharePoint design and migration — information architecture and permissions planned before content moves, so the result is usable rather than a copied file server.
The problem is almost never SharePoint
When a business tells us SharePoint is terrible, the deployment is nearly always a file server that was copied into the cloud without anyone designing anything.
That produces exactly what you would expect: the same forty top-level folders, the same nine levels of nesting, the same three copies of the same document in different places, and now also broken sync, path length errors and search results that are worse than the old Windows search everyone complained about.
SharePoint is a document management system that will happily impersonate a file share, badly. Used as designed it is genuinely good. The work that makes the difference happens before any content moves.
What the design covers
Sites and libraries. Structured around how the business is organised and how people actually look for things, which is often not how the current folders are arranged. Departments, projects and clients are common organising principles; “Shared” and “Misc” are not.
Permissions. Built on groups mapped to roles, applied at library or site level, and documented. The alternative — individual exceptions accumulated file by file — becomes unauditable within about a year, and it is the single most common thing we are asked to untangle.
Metadata where it earns its place. Not everywhere. A handful of properties on the libraries where filtering genuinely helps, such as client, status or document type. Over-engineering metadata is its own failure mode and staff route around it.
Sync scope. Which libraries sync to laptops and which stay online. Attempting to sync everything is how you get conflict files and full disks.
External sharing. Enabled deliberately, with expiry dates and periodic review, so working with clients and contractors is possible without links living forever.
Migrating less than you have
The audit almost always finds that a large proportion of content has not been opened in years. Some of it is genuinely dead. Some is duplicated three times. Some should be archived rather than migrated.
Moving less is faster, cheaper and produces a more usable result. This is the least glamorous part of the project and reliably one of the most valuable.
Adoption is the deciding factor
SharePoint deployments fail on habit more than on configuration. People who have used a mapped drive for a decade need to be shown, briefly and practically, where things now live, how to search rather than browse, how check-out and version history work, and why they should stop emailing attachments.
Twenty minutes per team, at the point of migration, changes the outcome substantially. Deployments that skip it end up with staff quietly creating a new shared folder somewhere and carrying on as before.