Some staff have reported that outlook automatically accepts meeting requests. 
This can be troubleshooted by checking 'Auto Accept/Decline' settings. 
1. Open Outlook, and then click the File tab.
2. Click Options and then Calendar in the left sidebar.
3. Make sure the the Auto-Accept, Decline button in the Automatic Accept or Decline section is unchecked. 
4. Click OK to save the settings and close the dialog box.

