Part of our company has moved to another area and they are being set up as a separate domain. The users can VPN in to our domain to run the app, but when they try to access the database it fails, because SQL Server is set for Windows Authentication, and they are on a different domain. It is a Windows C# app, we are using SQL Server 2005 Express, I could set this for mixed mode Authentication but I'm still not sure how to proceed from there.