I apologize if I missed mention of this in the forum somewhere, but it appears that the SOS server may not support SourceSafe 8. This is not to say that it should - after all SSafe 8 is still beta - this was just a test. However, I was wondering if there were any plans to support SSafe 8 in the near future? Our team would really love to start using these two tools together.
I wish I had saved the error message from the SOS server log, but it was clear that SOS couldn't communicate with the SourceSafe databases using the ssapi.dll provided in version 8. A property in the automation interface wasn't being passed by SOS in the manner that version 8 was expecting.
Reverting to 6.0d on the server did resolve SOS' database communication problem, although doing so introduced new problems for developers using either SOS or SSafe 8 exclusively. That's another story.

Thanks