All of a sudden no one able to receive any attachments from the internal orgnaization

are all the users on the same exchange 5.5 server?
where does the message go with the attachment?
do the users get the message without the attachment?
any errors while sending the message with the attachment?

Users sending the message they have Exchange 2003
Users recieving the message on Exchange 5.5
they get the messages but, it is just the body no attachment .doc or pdf or any attachment this is what they get:
MIME-Version: 1.0

 

X-Mailer: Internet Mail Service (5.5.2653.19)

 

Content-Type: multipart/alternative;

 

boundary="----_=_NextPart_001_01C701E7.AAD0EB00"

 

Date: Mon, 6 Nov 2006 21:12:52 +0000 (UTC)

 

This message is in MIME format. Since your mail reader does not

 

understand

 

this format, some or all of this message may not be legible.

 

------_=_NextPart_001_01C701E7.AAD0EB00

 

Content-Type: text/plain




########################################################################

 

#############

 

Note:

 

This message is for the named person's use only. It may contain

 

confidential,

 

proprietary or legally privileged information. No confidentiality or

 

privilege

 

is waived or lost by any mistransmission. If you receive this message

 

in error,

 

please immediately delete it and all copies of it from your system,

 

destroy any

 

hard copies of it and notify the sender. You must not, directly or

 

indirectly,

 

use, disclose, distribute, print, or copy any part of this message if

 

you are not

 

the intended recipient. ICON Capital and any of its subsidiaries each

 

reserve

 

the right to monitor all e-mail communications through its networks.

 

This e-mail message has been scanned for Viruses and Content and cleared

 

by NetIQ MailMarshal. Thank You.

 

########################################################################

 

#############

 

------_=_NextPart_001_01C701E3.45E52E80

 

Content-Type: text/html

 

Content-Transfer-Encoding: base64

 

<removed by sembee>

No there was no any antivirus upgrades. We are using Norton 7.5 Corporate Edition.
The strange is when you send the meail as a user the recepient users get the mime related error. If the email is send as administrator everyting is OK. We even added on of the users to the administrators  group and did not solve the problem. Your advise is appreciated.

Thanks,

Correction on my first postin: The user sending the email are using Exch 5.5 and the receiving is Exch 2003.
Thanks

We did stop the anitvirus on the Exch 5.5 server and did send the attachment to Exchange 2003 users with no luck.