SBS for Server 2003 Having SP2 Update Problems
Apparently there is a known bug in the delivery mechanism for SP2 on SBS. If you're clicking to approve the update in Update Services, you get an unhandled exception error. According to the Official SBS Blog, this is a known error that you can safely continue through.
More info on their blog: http://blogs.technet.com/sbs/archive/2007/03/19/error-when-trying-to-approve-windows-2003-sp2-within-update-services.aspx

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