[There's a reason that Yoda is the unofficial mascot of SBS.  Size indeed matters not.] Can't put SBS 2003 r2 over the top of a Windows 2003 r2 - THE OFFICIAL BLOG OF THE SBS "DIVA"
Mon, Jun 25 2007 19:00 bradley

Can't put SBS 2003 r2 over the top of a Windows 2003 r2

Error message when you try to upgrade to Windows Small Business Server 2003 R2: "Setup was interrupted because of either user intervention or an unexpected error":
http://support.microsoft.com/default.aspx?scid=kb;en-us;936915&sd=rss&spid=3208

Windows 2003 r2 is a different schema than SBS 2003 r2, ergo this is why this message is received.

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