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 &nbsp; I don't believe that is possibe. SBS wants the entire FSMO. It can be one or the other but not both.
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You can have a SBS 2003 server as a member server. &nbsp; Of course the SBS 2008 will have to be the only DC with all FSMO roles. &nbsp;Refer to this answer...<a href="https://www.experts-exchange.com/questions/22457558/adding-a-member-server-to-SBS-2003.html" rel="ugc">https://www.experts-exchange.com/questions/22457558/adding-a-member-server-to-SBS-2003.html</a>
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SBS domains are restricted to only one DC. That is a restriction Microsoft puts in place for those businesses who use SBS. They want you to eventually upgrade and purchase Windows Server full blown ver. . . . . 
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I stand corrected. &nbsp;Thanks suppsaws....<br />
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More info here....<br />
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<a href="http://support.microsoft.com/kb/884453" rel="ugc nofollow">http://support.microsoft.com/kb/884453</a>
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I just got a new server with SBS2008 that will replace the SBS2003 server. I would like to use the SBS2003 server as a member server with out buying 2003 or 2008 standard. Is it posible?
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I just got a new server with SBS2008 that will replace the SBS2003 server. I would like to use the SBS2003 server as a member server with out buying 2003 or 2008 standard. Is it posible?

Can I demote my SBS2003 server with SBS2008

Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).