Aceleroo

When I open email messages in Outlook, to read, and close again, the modified date is changed. Microsoft claim not to change these, and that antivirus products such as ESET Antivirus makes the change. I've found some ESET settings to turn off modifying access date in files (NTFS filesystem) but I can't see any options to stop tampering with any email timestamps. Please test for me and find out if it's ESET that's making the changes, or not?