Comment 10 for bug 154145

>Is it true when Linux and Mac OS X? (sorry but I can test with Win only)
It is a case with OS X.

It made it from Tb 1.5.10 as follows.
    |
   +-A.B.C.
         |
         +--sub1
And the message save to "A.B.C." and "sub1".

When this profile was used with 1.8branch Tb, the profile was as follows.
-rw------- 1 sek sek 750 5 5 06:47 A.B.C.
-rw-r--r-- 1 sek sek 2154 5 5 06:47 A.B.C..msf
drwxr-xr-x 4 sek sek 136 5 5 06:47 A.B.C..sbd/
-rw-r--r-- 1 sek sek 0 5 5 06:49 A.B.Ce6bad49d
-rw-r--r-- 1 sek sek 1095 5 5 06:49 A.B.Ce6bad49d.msf

So, the message is not seen though there is "A.B.C." in the folder list.
There is no change even if "Rebuild index" is executed.
Of course, it cannot access subfolder.

And two "A.B.C." appears when 1.8branch Tb is re-started.
In this case, it cannot access the message and the subfolder.

If the work around of comment#2 is not executed, the message cannot be seen with 1.8branch Tb.