Problem winmail.dat and TNEF

[mul]

Hello,

i Have Mailscanner 4.83.25 as gateway for my exchange 2010.

Some users receive bad mail with winmail.what is weird is that same email sent 
from outside to multiple recipients, will be good for three users and the last 
has winmail.dat.
I look in logs and i found this :


Feb 21 16:26:34 ssgmail11 postfix/cleanup[13326]: 45651223C32: hold: header 
Received: from ecisnet196.ec-is.net (ecisnet196.ec-is.net [62.62.128.89])??by 
mailhost.iiiiii.fr (Postfix) with ESMTP id 45651223C32??for 
<aurelie.salan at XXXX.fr>; Tue, 21 Feb 2012 16:26:34 +010 from ecisnet196.ec-
is.net[62.62.128.89]; from=<prvs=039899099c=celia.quele at oooooooooooooo.fr> 
to=<aurelie.salan at XXXX.fr> proto=ESMTP helo=<ecisnet196.ec-is.net>
Feb 21 16:26:34 ssgmail11 postfix/cleanup[13326]: 45651223C32: message-
id=<B089CFA5035B0F46814980F392A758AA01048D at hcu88.dit.cb>
Feb 21 16:26:34 ssgmail11 postfix/smtpd[13325]: disconnect from ecisnet196.ec-
is.net[62.62.128.89]
Feb 21 16:26:34 ssgmail11 MailScanner[13458]: New Batch: Scanning 1 messages, 
38837 bytes
Feb 21 16:26:34 ssgmail11 MailScanner[13458]: Expanding TNEF archive 
at /var/spool/MailScanner/incoming/13458/45651223C32.A18CA/winmail.dat
Feb 21 16:26:34 ssgmail11 MailScanner[13458]: Trying to unpack nwinmail.dat in 
message 45651223C32.A18CA, could not create subdirectory 
45651223C32.A18CA//tnefRDxo5W, failed to unpack TNEF message
Feb 21 16:26:34 ssgmail11 MailScanner[13458]: Corrupt TNEF winmail.dat that 
cannot be analysed in message 45651223C32.A18CA
Feb 21 16:26:34 ssgmail11 MailScanner[13458]: Virus and Content Scanning: 
Starting
Feb 21 16:26:37 ssgmail11 MailScanner[13458]: Saved entire message 
to /var/spool/MailScanner/quarantine/20120221/45651223C32.A18CA

It is problem with my mailwatch ?
I found that others guys on forum had update TNEF.PM with the last version, 
how to do that  ?