If there are significant modifications to search.aspx in SPS 2003, will they be lost when upgrading to MOSS 2007?
Surprisingly, they will NOT be lost.
search.aspx The Search.aspx file is not modified or has been overwritten in the office A SharePoint Server 2007 update is processed. The custom settings on this page should continue to work after the upgrade.
search.aspx
The Search.aspx file is not modified or has been overwritten in the office A SharePoint Server 2007 update is processed. The custom settings on this page should continue to work after the upgrade.
http://msdn.microsoft.com/en-us/library/ms564715.aspx