I have been upgrading a customer from desktop Office 2013 to the Office 365 Desktop apps. Outlook is problematic. They go in and turn off both delivery and read receipts yet within a day or two they are both checked again. I got on one of their computers and did it myself. Unchecked delivery and read receipts. Closed Outlook. Opened Outlook and they were both still unchecked. Yet a day or two later they were checked again. Microsoft, as usual, is clueless. Anyone else seen this is you?