Outlook calendar items come in plain text and can't respond to them

I am having issues with how I receive calendar appointments with Outlook 2003, SP3. No matter what format certain people send them from, they come in plain text looking like the following: (is this an Exchange issue of an Outlook issue, I have Outlook to retrieve from our Exchange server via Pop3.):

Received: from mail20.messagelabs.com ([216.82.245.67]) by mail.professionalaccess.com with Microsoft SMTPSVC(6.0.3790.3959);
       Mon, 15 Oct 2007 21:22:43 -0400
X-VirusChecked: Checked
X-Env-Sender: clboucher@professionalaccess.com
X-Msg-Ref: server-3.tower-20.messagelabs.com!1192497665!28574555!1
X-StarScan-Version: 5.5.12.14.2; banners=-,-,professionalaccess.com
X-Originating-IP: [208.97.132.81]
X-SpamReason: No, hits=0.0 required=7.0 tests=
Received: (qmail 7290 invoked from network); 16 Oct 2007 01:21:06 -0000
Received: from sd-green-bigip-81.dreamhost.com (HELO spaceymail-a3.g.dreamhost.com) (208.97.132.81)
  by server-3.tower-20.messagelabs.com with SMTP; 16 Oct 2007 01:21:06 -0000
Received: from cboucher (adsl-69-237-252-238.dsl.pltn13.pacbell.net [69.237.252.238])
      by spaceymail-a3.g.dreamhost.com (Postfix) with ESMTP id 5742C1952A6;
      Mon, 15 Oct 2007 18:21:05 -0700 (PDT)
From: "Chuck Boucher" <clboucher@professionalaccess.com>
To: <clboucher@professionalaccess.com>, <chuckboucher@comcast.net>
Subject: test
Date: Mon, 15 Oct 2007 18:21:08 -0700
Message-ID: <000301c80f92$d474b7c0$210ba8c0@cboucher>
MIME-Version: 1.0
Content-Type: text/calendar; method=REQUEST;
      charset="utf-8"
Content-Transfer-Encoding: 7bit
X-Mailer: Microsoft Office Outlook 11
Thread-Index: AcgPktQO+dOHNzj+QI+nyi/fA0m2RQ==
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198
Return-Path: clboucher@professionalaccess.com
X-OriginalArrivalTime: 16 Oct 2007 01:22:43.0368 (UTC) FILETIME=[0D0DDA80:01C80F93]

BEGIN:VCALENDAR
PRODID:-//Microsoft Corporation//Outlook 11.0 MIMEDIR//EN VERSION:2.0 METHOD:REQUEST BEGIN:VEVENT ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:clboucher@professionalaccess.com
ATTENDEE;ROLE=REQ-PARTICIPANT;RSVP=TRUE:MAILTO:chuckboucher@comcast.net
ORGANIZER:MAILTO:clboucher@professionalaccess.com
DTSTART:20071017T173000Z
DTEND:20071017T180000Z
LOCATION:test
TRANSP:OPAQUE
SEQUENCE:0
UID:040000008200E00074C5B7101A82E008000000005062A927580FC8010000000000000000100
 00000EC960B7A37970041ACF590C556A0D30A
DTSTAMP:20071016T012107Z
DESCRIPTION:When: Wednesday\, October 17\, 2007 10:30 AM-11:00 AM
  (GMT-08:00) Pacific Time (US & Canada).\nWhere:
  test\n\n*~*~*~*~*~*~*~*~*~*\n\n\n
SUMMARY:test
PRIORITY:5
X-MICROSOFT-CDO-IMPORTANCE:1
CLASS:PUBLIC
BEGIN:VALARM
TRIGGER:-PT60M
ACTION:DISPLAY
DESCRIPTION:Reminder
END:VALARM
END:VEVENT
END:VCALENDAR


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