Regenerate nnfolder:archive?

[Brett Randall]

Hey all

I've copied some old sent mail from when I used Gnus years ago into my
~/Mail/archive/mail folder (where my current sent mail lives), have
removed all the .mrk and .nov files from the old files and tried to
regenerate the nnfolder:archive server by going into the server buffer
and hitting 'g'. It says regeneration done, but it doesn't display all
my old mail - only the new archives.

I'm not really familiar with the nnfolder backend - can you not just
copy data in and regenerate as you can with nnml?

Thanks

Brett.