EXPERT RESPONSE
The short answer is that YES, you can accomplish what you are looking to do; however, you'll most likely have to reinstall your NT 4.0 server software.
Here's the scoop. Microsoft created its Small Business Server as a very low cost solution for small businesses that would never need more then 75 users accessing it.
In the outline you provided of your current NT4 server configuration, you didn't mention whether or not it was set up as a Domain controller, but I suspect that it is.
The issue you must deal with is that, although an SBS and an NT4 server can coexist on the same network, by design, SBS must be a Domain controller (at the root of the forest), so it can not "join" an NT4 (or any other) domain.
One solution would be to create two separate domains; one for CRM and another for the NT4 server. Although it is possible to have two domains on the same network that "trust" each other, this would be messy and could create a number of (domain synchronization) issues going forward. So I don't recommend this approach.
A cleaner, more easily maintainable solution going forward would be to convert your NT4 server from a Domain controller to a Member server. Unfortunately, unlike with MS2000-2003, you can't reconfigure an NT4 server to a Member server; you have to reinstall it from scratch. Because a complete re-installation would be required, I would recommend that you upgrade this server to MS2000-2003, while you're at it.
As far as accessing your SBS CRM server from a remote location goes...this should not be a problem. The remote users can use a VPN connection to easily log into the CRM software utilizing their browser (it must be Microsoft IE, not Netscape, etc.). If you have the proper DNS setup, your remote users can just type in the server name in IE's address space and click "go." The CRM software will prompt the user for a login and password and then open.
I'd like to thank Ron Smoller of GraVoc Associates, Inc. for assisting me with the answer to this question.
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