Templates ($YEAR, $MONTH, $DAY)don't work anymore in newest version (0.107) .
Probably because of new restriction in filenames (only
(()+-0123456789;=@ABCDEFGHIJKLMNOPQRSTUVWXYZ[]
_abcdefghijklmnopqrstuvwxyz)are allowed)

When I'm applying path :
myArchive.zip#$YEAR\$MONTH\$YEAR$MONTH$DAY-$FROM-$SUBJ

in effect all emails stored in myArchive.zip are placed in the root directory,for example :
2008_03_20080301-BillGates-Greetings
2008_03_20080302-Obama-Greetings2
instead of in directory structure:
myArchive.zip#2008\03\20080301-BillGates-Greetings
myArchive.zip#2008\03\2008_03_20080302-Obama-Greetings2

I guess that during checking for invalid characters, all '\' characters are replaced by '_' characters (but it's only a guess ;)