Been down that road before... giving users two drive letters to the same data, with one deeper mapped. Had too many users figured they somehow had two copies of everything so they'd delete one of them. DOH!

Now I have just one drive letter to a DEPT share and they can walk the tree. Most apps let you set their 'start in' folder or come back to where you were last so no big deal.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.