I don't know if a canned migration exists.

Microsoft Access is a great tool for getting data from csv, ODBC data sources into
local tables which you can "massage" into table designs which MAS can import
via Visual Integrator.

I would use an older version of Access 2003 - 2007

I've used it for Peachtree, Quickbooks Enterprise etc.

NetSuite is just data, figuring out how it's organized is the challenge

Sounds like a fun project. Good luck

Most people use Microsoft Access. Import your Netsuite data into it, build the tables you need, create text files and import into Sage 100. Have you check with Greytrix? They do stuff like this.

Here is one way to do it: Use a conversion service like the NetSuite to Quickbooks conversion service to convert to Quickbooks and then migrate the data to Sage 50.

http://quickbooksrepairpro.com/convert-netsuite-to-quickbooks.aspx

Other thoughts and ideas are welcome.