Quickest way is to export the revit file to a dwg.
You sould be able to export it back to Acad 2000, 2004, 2007 & 2010 if you need to (from Revit 2010 anyway).
Got ot he big R (top Left of screen)
Export / Cad Formats / Dwg
There is an export file where you can set up your layers to look lie your traditional cad file. Takes a bit of time but is worth it.