Defragmentation of NT Server

I am consulting on a NT 4 server and noted that NT server does not come with a defragmentation program, though it does seem to indicate a place for it. The system I am looking at has been up for three years and needs to be defragged.

I also noticed that the standard Norton programs aren’t to be used with the NT server. Why is this?

What programs are available to defrag NT Server and which is best? The only thing I have found so far is Diskeeper.