There is a perl script that will turn a mbox file to Maildir.
Then you can manipulate the messages individually and cat them back together 
after you are done.
I think... 

Man, why are you still "mbox(ing)" ?   :)
ET 


Joe writes: 

> Hey all, 
> 
> I have a user with a huge mailbox that is borking things up here. I was
> going to drop all mail older than the 19th to reduce the filesize. I had
> planned to do this by opening it in vim, finding the first line with
> "Jul 18" and remove from the line before it to line 0. Problem is, it's
> a 160+ MB file and vim doesn't handle that too well. I know which line
> number I want to delete to though. So here's the question.... 
> 
> How can I remove from line 0 to line 1000000 (as an example) from the
> file? Or, how can I export from line 1000001 to the end in a new file
> (which I could then replace the current mailbox file with)? I have no
> idea how to accomplish either. 
> 
> Thanks in advance for any help! 
> 
> -Joe
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