Status update on IAS issue
Well, made SOME progress on the IAS issue. Had a developer from Redmond give me a call, and we quickly found out that one problem was the fact the Platform SDK build environment was mapping the C compiler to the VS2005 stuff (MSVCR80). One problem... the C runtime on SBS is for VS2003 (MSVCR71), except on R2, which we don't run here in any environment.
Running "depends.exe" quickly showed that the runtime was missing. So I copied the latest Platform SDK SetEnv.cmd script and altered it to force it to pick up the VS2003 C compiler. Voila. Now that side of things is working properly.
Of course, IAS still won't load the bloody DLL. *sigh*
Back in Microsoft's hands. Hopefully they will be able to figure it out tomorrow and give me a call.