The biggest reason firms stay on software they've outgrown isn't the price of something new. It's fear of the move. Years of matters, contacts, notes, documents and billing history live in the old system, and nobody wants to be the one who loses them. I spent years moving data out of legacy systems for a living, first as a data integration engineer and then at enterprise scale. Here's the plan I follow.
1. Take inventory
List every place firm data lives, not just the main system: spreadsheets, shared drives, e-mail folders, the accounting system and the one Access database someone built years ago. For each source, note what it holds, roughly how many records, and who relies on it. Surprises found now are cheap; surprises found after cutover are not.
2. Get the data out
Most case management products offer exports, an API or both. Exports are often incomplete, missing custom fields, notes or the links between records, so I check what each method returns before relying on it. Legacy databases are usually easier: SQL Server, Access and similar sources can be read directly. Documents are exported with their folder structure and any metadata that ties them to a matter.
3. Clean it up
Old data is messy. The same person appears three times with different spellings. Matters are missing stages or open dates. Free-text fields hold information that should be structured. Cleaning includes:
- De-duplicating contacts and merging their history
- Standardizing names, addresses, phone numbers and dates
- Pulling structured values out of notes and PDFs where it's worth it, which is a job AI extraction handles well with a person checking the results
- Flagging records that need a human decision, instead of guessing
4. Map old to new
Every field in the old system needs a home in the new one, or a deliberate decision to leave it behind. The mapping document becomes the contract for the migration: what moves, where it goes and how it's transformed. Stages, matter types and user names almost always need translation tables.
5. Test loads you can check
Before anything goes live, the full data set is loaded into a test copy of the new system. Then it's checked two ways: by the numbers (record counts per table, totals per matter, open balances) and by people, with staff spot-checking matters they know well. Anything that doesn't match gets fixed in the migration scripts, and the load runs again from scratch. Repeatable scripts, not manual fixes, are what make the final run safe.
6. Plan the cutover
The final move is scheduled for a quiet window, usually a weekend. The old system is frozen, the last changes are pulled, the tested scripts run, the counts are compared again, and the firm starts Monday in the new system. The old system stays available read-only for a while, so nobody has to worry about something that didn't come across.
7. Keep the receipts
Keep the raw exports, the mapping document and the reconciliation reports. If a question comes up months later about where a record went, the answer is on file.
Phasing the move
Migration doesn't have to be all at once. A firm can start with new matters in the new system while old matters finish in the old one, or move one practice group at a time. Custom software makes this easier, because the new system can be built to read from the old one during the transition.
Thinking about a move? Book an intro call and bring a list of where your data lives. See also data extraction and migration services.