PMM2MOZ is a program to convert PMMail *.msg files to Mozilla / Firefox format. It's been uploaded to Hobbes and is still in /pub/incoming directory, but is expected to be moved to /pub/os2/apps/internet/mail/reader. Search for it:
http://hobbes.nmsu.edu/cgi-bin/h-search?key=pmm2moz.zip
Source: OS2VOICE