[Samba] Thunderbird 24.0 for Windows seems to ignore Samba4.0.9 permissions settings

[Kevin Field]

Hi,

I have a CentOS 6.4 fileserver running SerNet Samba 4.0.9 with these 
global settings (not overridden):

         read only = No
         force create mode = 0777
         force directory mode = 0777
         inherit acls = yes
         inherit owner = yes
         inherit permissions = yes

On a Windows client, I have Thunderbird 24.0 storing its profile and 
mail on the Samba share.  The perms on everything in the share were 
chmod -R 777'd.

Then I get mail, compact a folder, whatever, and it looks like this:

-rwxrwxrwx. 1 1128 513        0 Oct 18  2012 Archives
-rwxrwxrwx. 1 1128 513     3158 Sep 25 13:20 Archives.msf
drwxrwxrwx. 2 1128 513     4096 Sep 25 09:12 Archives.sbd
-rwxrwx---+ 1 1128 513        0 Sep 25 13:49 Drafts
-rwxrwx---+ 1 1128 513     2450 Sep 25 13:50 Drafts.msf
-rwxrwx---+ 1 1128 513        0 Sep 25 13:08 Inbox
-rwxrwx---+ 1 1128 513     2317 Sep 25 13:50 Inbox.msf
drwxrwxrwx. 3 1128 513     4096 May 28 09:26 Inbox.sbd
-rwxrwxrwx. 1 1128 513     1268 Apr 12  2007 Junk.msf
-rwxrwxrwx. 1 1128 513       28 Oct  2  2012 msgFilterRules.dat
-rwxrwxrwx  1 1128 513    13736 Sep 25 13:50 popstate.dat
-rwxrwxrwx  1 1128 513 96061164 Sep 25 13:21 Sent
-rwxrwx---+ 1 1128 513  2988277 Sep 25 13:21 Sent.msf
-rwxrwxrwx. 1 1128 513        0 Mar 25  2010 Templates
-rwxrwxrwx. 1 1128 513     2684 Sep 25 13:20 Templates.msf
-rwxrwx---+ 1 1128 513        0 Sep 25 13:50 Trash
-rwxrwx---+ 1 1128 513     2223 Sep 25 13:50 Trash.msf

Whatever it touches is now 770.  How can that be, when the parent of 
this folder is 777, Samba is set to inherit and force 0777?  Is this 
Samba misbehaving, or Thunderbird?

Thanks,
Kev