The delete schedule report button does not work as intended on IE8 and Firefox browsers.
It prompts for confirmation of deletion but does not actually remove the deleted schedule report.
A current workaround is to edit the schedule report (Version 1.0.7.0 and later required)
and change from e-mail to archive into an appropriate folder that can be deleted.
The folder will be saved in the TNG directory:
Windows - C:\Program Files\Datatex\TNG - double click on folder name as per schedule setup
Linux - /opt/datatex/tng - double click on folder name as per schedule setup