I have not been around here for a while, but I thought I would post today's issue in case it can help others. Today, exporting a PO to email (Outlook) as HTML stopped working today after many years. It looked normal, but the email body would be blank after sending. After a while I decided to check and see if any updates had installed. Lo and behold IE 11 had installed this morning. I removed it and the problem went away.
MS toys should play nice together!
Hope that saves someone a few hours of hair pulling.
Marc