eimmigration's software overview says the implementation team can import a firm's existing case and client data, and its training and support page lists data migration among its professional services.
The pricing page describes a standard import for firms coming from a supported platform or loading data through eimmigration's Excel template, and it names 18 sources, among them Clio, Docketwise, INSZoom, LawLogix, LollyLaw, and MyCase. A firm on a system outside that list gets a custom migration plan that eimmigration scopes for it. WhatIsBest's comparison of immigration law software for US law firms advises putting migration in the same written quote as the subscription. That quote should say whether the firm's import is standard or custom.
eimmigration's data conversion page publishes the mapping for those supported platforms. A visitor selects a vendor and sees its data fields marked supported or not supported. A firm can read the chart for its current system before it talks to sales and list the fields it relies on that are marked not supported. Each of those needs a decision, whether that is a custom field, a note, or leaving the data in the old system's archive.
On the same page, eimmigration says it will tell the firm within three to five business days of getting the data whether the import can go ahead. Once the conversion is done, the firm gets two business days to look over its records in eimmigration, and eimmigration takes the data back out if the import falls short of what the firm needs. Decide which records staff will open before the files are sent. The page adds that separate databases can be combined into one, with no duplicate check when they are. A firm combining two offices should plan how duplicate clients will be found.