Outlook 2007 Calendar Invite to Remote Outlook User Seen as Gibberish

Can someone please let me know why one of our Outlook users is having a problem inviting a user at a client company to a meeting?  The calendar invite recipient in the other company sees the invite as an e-mail with gibberish in it.  I know this is BASE64 code but I need to know how to fix the problem.  Is the problem with the recipient's Outlook?  We have Exchange 2007 with all the latest updates consisting of an Edge server, a CAS/HT server and a mailbox server.  All of Outlook users here at our company are on Outlook 2007. Any help in troubleshooting will be greatly appreciated!

-----Original Message-----
From: Person.Inviting [mailto:Person.Inviting@redacted_our_company.com]
Sent: Friday, May 08, 2009 2:44 PM
To: 'remote_user@remote_company.com'
Subject: Discuss Project Timing and Initial Target List
Return-Path: <Person.Inviting@redacted_our_company.com>
Received: from mail.redacted_our_company.com (mail.redacted_our_company.com [xx.xxx.xx.xx] (may be
forged))
      by xxxxx.xxxx.com (x.xx.x/x.xx.x) with ESMTP id n48Ii6h8039623
      (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=FAIL);
      Fri, 8 May 2009 11:44:10 -0700 (PDT)
      (envelope-from Person.Inviting@redacted_our_company.com)
Received: from server_name.our_internaldomain.com (xx.x.x.xxx) by mail.redacted_our_company.com
 (xxx.xxx.xxx.x) with Microsoft SMTP Server (TLS) id 8.1.358.0; Fri, 8 May
 2009 14:44:01 -0400
Received: from server_name2.internaldomain.com ([10.0.0.184]) by server_name.internaldomain.com
 ([10.0.0.181]) with mapi; Fri, 8 May 2009 14:44:07 -0400
From: Person Inviting <Person.Inviting@redacted_our_company.com>
To: "'remote_user@remote_company.com'" <remote_user@remote_company.com>,
        =?utf-8?B?Q29uZmVyZW5jZSBSb29tIFdhbGtlcuKAmXMgQ2F5?=
      <conferenceroom2@redacted_our_company.com>,
Date: Fri, 8 May 2009 14:44:05 -0400
Subject: Discuss Project Timing and Initial Target List
Thread-Topic: Discuss Project Timing and Initial Target List
Thread-Index: AcnMx2ZdqwPLsHomSJC/BVxHUGo71wDRZBVQ
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