After GW 7 upgrade from GW 6.5, some messages are illegible on external mail clients

I manage a Windows 2003 network running Exchange 2003 for a division of another much larger company. They are a primarily Novell shop and run Groupwise for email. I know little of the Novell side of the house but am part of that organization so we are working on this problem together. Here is the scenario:

They upgraded their Groupwise email server from 6.5 to 7. While the version change went well, we are now experiencing problems with emails sent from GW to our Exchange server and clients running Outlook 2003. This is also happening to other businesses/customers/vendors that run Outlook 2003 for the client application. Apparently the bodies of some of the emails are getting either corrupted or not decoded properly and frequently the To/From fields show up empty. I found an article that smells like our problem but did not provide a fix:

http://groups.google.com/group/microsoft.public.exchange.admin/browse_thread/thread/6323931bfbd2871f

Is this a problem with MIME somehow, or maybe a malformed header? I know that GW changed to UTF-8 as well. There are hot fixes we can apply to our Exchange server that assist with this but Im not sure it is the problem. Additionally, I don't want to fix something on our end and not have an avenue to test any attempted resolutions on the GW side. Remember , this is happening on external companies to our own and it's not like we can just call them up and say "fix your mail server".

Any help would be greatly appreciated. Here is a message header from one of the emails:

From:
Sent: Tuesday, October 09, 2007 4:09 PM
Subject:

X-Mailer: Groupwise 6.5
Message-ID: <20071009T170836Z_AB9000040000@ourgroupwiseserver.com>
From: "Chelsie" <ChelsieS@groupwiseemail.com>
Subject: RE: AP INVOICE
To: "Chris" <Chris@ourexchangeserver.com>
Content-Type: multipart/alternative; boundary="____KNARURPLBSLFYKFKBBHS____"
Return-Path: ChelsieS@groupwiseemail.com
X-OriginalArrivalTime: 09 Oct 2007 22:08:55.0835 (UTC) FILETIME=[FC069EB0:01C80AC0]


--____KNARURPLBSLFYKFKBBHS____
Content-Type: text/plain; charset=utf-8
Content-Language:
Content-Transfer-Encoding: base64

VGhhbmsgeW91IHNvIG11Y2ggZm9yIHlvdXIgaGVscC4gU29ycnkgSSBkaWQgbm90IGhhdmUgeW91
ciBuYW1lIHRvIGNvbWUgdG86KQ0KSGF2ZSBhIGdvb2QgZXZlbmluZy4gDQoNCkNoZWxzaWUgU2No
dWx0eg0KQ0NDIEdyb3VwLCBJbmMuDQpBL1AgRGVwdC4NCjIxMC02NjItNDUzNyBPZmZpY2UNCjIx
MC02NjItMTYwNCBGYXgNCkNoZWxzaWVTQGNjY2dyb3VwaW5jLmNvbQ0KDQoNCj4+PiAiQ2hy
MC02NjItMTYwNCBGYXgNCkNoZWxzaWVTQGNjY2dyb3VwaW5jLmNvbQ0KDQoNCj4+aXN0
aW5hIE9waGFuaW0iIDxjb3BoYW5pbUBhaXJjb250cm9sc2NpZW5jZS5jb20+IDEwLzkvMjAw
aW5hIE9waGFuaW0iIDxjb3BoYW5pbUBhaXJjb250cm9sc2NpZW5jZS5jb20+NyA0....................................................
Q2hlbHNpZVNAY2NjZ3JvdXBpbmMuY29t
--____KNARURPLBSLFYKFKBBHS____
Content-Type: multipart/related; boundary="____OCWUZBXJOPTSURTKJFTX____"


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