Exchange Server 2007 Calendar Bounceback

We are receiving bouncebacks for a user who is no longer active (she was a delegate or shared user on a current users calendar).

When a user sends an invite for a request she receives a bounce back regarding the disabled users account seen below.

We Disabled the user’s Exchange account in Exchange Management Console first, to avoid ending up with a “Disconnected” Exchange account. Disable the Domain account.  Move the Domain account to the “Former Employees” group.

I have used mfcmapi.exe to clear out Delegates and then added another Delegate back to the calendar via Outlook (separate user entirely).

Delivery has failed to these recipients or distribution lists:
 
Jane Doe
The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.
 
  _____  
Sent by Microsoft Exchange Server 2007




 
Diagnostic information for administrators:
 
Generating server: exchange.mydomain.local
 

#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
 
Original message headers:
 
Received: from exchange.mydomain.local ([192.168.24.13]) by exchange.mydomain.local
 ([192.168.24.13]) with mapi; Tue, 11 Sep 2012 10:21:00 -0400
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: ********* ********** <>
To: Jane Doe
        <>
Date: Tue, 11 Sep 2012 10:20:59 -0400
Subject: TEST
Thread-Topic: TEST
Thread-Index: Ac2QKKePii8KpeU0R5mw7ZYxn8KgZAAAAGeQ
Message-ID: <>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator: <>
acceptlanguage: en-US
MIME-Version: 1.0