As you know, I too have an N900 with a non-functioning microphone. Reflashing the firmware did nothing to resolve the problem. I talked to Nokia today, and they refuse to repair or replace it; they say I have to go back to the retailer. Amazon won't replace it either. They will refund my money, but they will not ship a new device. The price has gone up significantly since I placed my pre-order, so no matter what, I'm going to incur additional out-of-pocket costs to get this factory defect corrected, which is total BS if you ask me.