What is Windows Server for Small Business Server?

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Many times I see people getting confused with this. I don't blame them, I was confused myself in the beginning. :)

The answer is here;

https://www.microsoft.com/windowsserver2003/sbs/evaluation/faq/prodinfo.mspx

Q. What is Windows Server for Small Business Server?

A.  Windows Server for Small Business Server (WSfSBS) is an operating-system only product based on SBS 2003 with Service Pack 1. It does not include any other applications, wizards, or integration tools that are found in the full SBS 2003 R2 product. WSfSBS has the same Active Directory limitations as SBS 2003 R2 (must be the root domain controller in the forest, does not support trusts, cannot move the FSMO roles) and has an additional limitation of only 15 SBS CALs. Lastly, there are no supported upgrade paths, either to SBS 2003 R2 or to Windows Server 2003 R2.

So, since it must also be the root DC in the forest, you cannot add it in an existing SBS domain.