The announcement of the Thunderbird 1.5 release on this list included the pointer:
A utility to migrate mail from PMMail to Thunderbird is available here:
HTTP://hobbes.nmsu.edu/cgi-bin/h-search?key=pmm_tbird
Note that I have just placed an update to this utility in Hobbes incoming. If you follow the above pointer and see a 2005 date, fetch pmm_tbird.zip from the "incoming" directory instead. The new version fixes a problem in migrating address book entries containing commas.
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Peter Moylan
http://www.pmoylan.org
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Source: OS2VOICE