The patch allows Administrators to control the migration behavior wrt IMAP and Local Folders files. Today, during migration, we copy all those (IMAP & Local Folders) besides others into the newly created dierctory for the migrated profile. Some external parties have expressed concern over this approach due the large amount of mails they have in 4.x folders and all of those getting copied again wasting the disk space and also making the migration too slow. So, a hidden pref mail.migration.copyMailFiles is introduced (which can be set to false) for those who those interested to share the 4.x IMAP and Local Folders. Please see the bug report for the possible side effects and other discussion points wrt the sharing folders with 4.x. The pref is set to true by default which means we will continue to do the migration the way we have always done.
Patch by henry.jia@sun.com. r=racham, sr=sspitzer, a=chofmann
git-svn-id: svn://10.0.0.236/branches/MOZILLA_1_0_BRANCH@124665 18797224-902f-48f8-a5cc-f745e15eee43
fdeb12057d