Message11355

I opened #2587 as a separate issue for the NTFS situation, because that phenomenon affects test_dumbdbm and test_shutil too.
This mostly explains why these failures are not commonly visible.

The remaining failure here seems to be date related:

Traceback (most recent call last):
  File "Lib/test/test_mailbox.py", line 1580, in test_mboxmmdf_to_maildir
    self.assertEqual(msg.get_date(), 0.0)
AssertionError: 1493984654.341 != 0.0