Actually Integration Services is a replacement for DTS. I believe you can
have both (if your server was upgraded from 2000). It is not mandatory that
you migrate from DTS to SSIS (but recommended).
But the question is can you manage a 2000 server using the new 2005 tools.
Obviously you cannot upgrade your DTS packages to the new SSIS if you are
still running a 2000 server (but trying to manage it with 2005 tools).
Management Studio does have a Legacy node that looks like it will let you
edit older DTS packages. When I clicked on it I got this message:
SQL Server 2000 DTS Designer components are required to edit DTS packages.
Install the special Web download, "SQL Server 2000 DTS Designer Components"
to use this feature. (Microsoft.SqlServer.DtsObjectExplorerUI)
That look promising.
Greg