Moving this post to the Sage 100 ERP Support Group so that other users of this software will see your question and be able to offer their thoughts and insight.

We use a terminal server for anyone outside of the office that needs to access Mas.  Sage doesn't recommend using the client/server architecture over a vpn but if you just remote into a terminal server that's at your corporate site you should be fine.  I guess it depends on how many people will be using it remotely, but this setup is pretty common I think and it works well for us.

Stuart,  We have this set up but it is very slow.  Is there any way you have found to speed this up?  Thanks, Tracy

Other options are:

Sage 100 ERP Standard via terminal server and a VPN

Sage 100  ERP Advanced with a VPN

GoToMyPC or similar software

Each have their pluses an minuses.

I'm not sure why that would be slow.  Any RDP session is going to be dependent on the speed of the internet at both locations, so I guess if you have a lot of people logging in remotely you could be using up your bandwidth.  

If you log in locally to the terminal server is it slow?  If it doesn't seem to be slow locally then I would have to assume that it's internet speed related...or possibly in the external firewall, but off the top of my head there's not anything that I can think of there, it should only be using port 3389.

If it is slow locally, it's possible the hardware is not able to keep up.  Glance at some of the performance utilities in Windows and see if they are maxing out.