It's bugging the bejeezus ou of my users (especially the folks opening it via
trans-oceanic links). There are tons of pop up messages saying Unable to open
http://blahblah.bla.com/Documents/Stuff.xls. The internet site reports that
the item you requested could not be found. (HTTP/1.0 404).

Now obviously it's trying to pull up links that no longer exist. How can I
either
1(Prefered) remove dead links or
2(Not so good) make it stop popping up with these errors?

These are very large spreadsheets.