Two entirely different programs. The only thing the same is name. Sage 100 US use to be Master Accounting Series of the '90s aka MAS90. Sage 100 UK use to be known as Line 100.

Thanks BigLouie. You are officially more helpful than Google!

Every time something like this comes up it amazes me how Sage thought it a good idea to name completely different products with the exact same name (Sage 50 Canada vs US) or misleadingly similar (Sage 100 / 100c vs Sage 100 Contractor), causing unnecessary confusion. I truly wonder how much time (and therefore $'s) have been wasted on this.

MAS90 was originally owned by State of the Art before Sage bought it which is why the DSN is SOTAMAS90. Line 100 was named because it meant you could setup 100 companies in the application.