My boss came in to ask me for some info from our site and I happened to have a 
SQL interface up in my window.  He'd never seen Window-shade mode before (and 
we both tend to work with a lot of windows "open"), much less Linux on a 
desktop, so when he asked if I could set up his computer to do that, I told 
him to let me convert more of my work to be done on my Linux system before I 
dove into teaching him a new OS.  He said he really didn't want to learn 
anything new.  He works with a lot of spreadsheets, so I explained the 
biggest difference would be that OpenOffice tends to use semi-colons where 
Excel uses commas in formulas.  Turns out he doesn't even use functions for 
most of what he does.  He just sends a bunch of figures out to the head 
office and lets them do all the crunching.
I figure with a few more lockups in Excel, or IE freezes, or another large 
batch of infected email warnings comes in (thankfully the hosts keep the 
scanner up-to-date), and we've got a ready and eager convert on our hands.  
(Now if I could just find myself an MS SQL Enterprise Manager that runs on 
Linux.  Maybe with wine...)