Converting an Rmail File to Inbox Format
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The command `M-x unrmail' converts a file in Rmail format to inbox
format (also known as the system mailbox, or mbox, format), so that you
can use it with other mail-editing tools. You must specify two
arguments, the name of the Rmail file and the name to use for the
converted file. `M-x unrmail' does not alter the Rmail file itself.
`M-x unrmail' is useful if you can run Emacs on the machine where
the Rmail file resides, or can access the Rmail file remotely (Note:Remote Files) from a machine where Emacs is installed. If accessing
Rmail files from Emacs is impossible, you can use the `b2m' program
instead. `b2m' is part of the Emacs distribution, it is installed into
the same directory where all the other auxiliary programs (`etags'
etc.) are installed, and its source is available in the Emacs source
distribution, so that you could copy the source to the target machine
and compile it there.
To convert a file `BABYL-FILE' into `MBOX-FILE', invoke `b2m' like
this:
b2m < BABYL-FILE > MBOX-FILE