exists update

[Walter Vaughan]

Brian K. White diagnosed properly:

>> A file not getting created is far more likely a problem with how & 
>> when & where you are creating the file.
>> One time what was happening to me in a very similar situation was the 
>> header _was_ getting created, but the data export that followed 
>> immediately after was overwriting the file, zapping the header.

I came in this morning and saw 35 messages in this folder. I thought all 
*ell had broken loose.

Brian's right here. Make sure if you manually control the operation the 
result works before blaming the switch.