Can SPS2003 Crawl WSS 3.0 or MOSS 2007 Content?
I get this question every once in a while and the answer is simple... No!
Check out this KB article for details... http://support.microsoft.com/kb/932743
SYMPTOMS
You configure Microsoft SharePoint Portal Server 2003 to crawl content that resides on a Microsoft Windows SharePoint Services 3.0 site or on a Microsoft Office SharePoint Server 2007 site. When you do this, some items are not indexed correctly.
Additionally, the following error message is logged in the SharePoint Portal Server 2003 gatherer log:
(0x80042616 - Error in the Site Data Web Service. ) Value does not fall within the expected range.
CAUSE
This issue occurs because SharePoint Portal Server 2003 does not support the crawling of content that resides on a Windows SharePoint Services 3.0 site or on a SharePoint Server 2007 site.