K 10
svn:author
V 6
jbeich
K 8
svn:date
V 27
2018-08-01T19:38:57.083098Z
K 7
svn:log
V 149
mail/thunderbird: switch to rc4

Changes:	https://hg.mozilla.org/releases/comm-esr60/pushloghtml?startdate=2018-07-25&enddate=2018-08-01
PR:		228477

END