OT: Mac Mail structure

[Graham Samuel]

I'm going to try to write a Rev app to fill a functional gap in  
Apple's Mail client (the annoying fact that you can't at a glance  
distinguish recently arrived emails from ones that came in to the  
same mailbox earlier but were left unread).  Probably the natural way  
to do this is with AppleScript, but I don't know AppleScript, and  
from what I've seen it's quite unintuitive in the way it interacts  
with the API of the OS. Anyway...

to do this without scanning an enormous number of messages each time,  
I think I need to be able to read the 'table_of_contents' and/or  
'content_index' files which appear in each mailbox. Can anyone  
suggest how I can find out the format for these - it sure ain't  
simple text.

TIA

Graham
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Graham Samuel / The Living Fossil Co. / UK and France