Things done to troubleshoot:
1)Verified that, in the trust center, outlook is not set to read all emails in plaintext
2)On an unused system, mapped outlook to that same accound. Issue persists.
3) Updates run. No dice.
4)Both settings (on the users PC and the test) are 1:1 the same
5)Can send HTML formatted emails to itself, but any coming from outside in has the ATTxxx.TXT
and the following code at the top:
Content-Type: text/plain; charset="us-ascii"
Things checked in Exchange:
Exchange Features have been verified as being thus:
Protocols - IMAP4
Provide message body as HTML, rich text format unchecked
Protocols - POP3