I'm using 6.80B6 32bit
There are still some file set grouping problems. It seems to be when the subject is just the file name with nothing else.
I'm looking at a set with the subject "vSFYFig3et.part01.rar" which also contains "87OoxAuAu7.part01.rar", "igxf81DkYd.part01.rar", and about 93 other ".part(1|01|001).rar's
plus the part2,3,4,etc.
Disclaimer: I don't know what these posts are. This is just an example.