Funny, I had exactly the same conversation with our IT today. Frankly, I still don't feel great about using a 3 prong laptop without the 3rd prong.
Originally Posted by ScottC
Yes and no. You'll be fine without the grounding, just expect the possibility of some "hum" from your speakers. Of course, I wouldn't run anything off one of those adapters that is safer with grounding (like a kettle or deep fryer), but that isn't what they are made for anyway.