Update adds a Group Policy to disable the Do Not Send a Response option in Outlook 2013 or hide it in Outlook 2016, Outlook 2019 and Outlook for Office 365

Administrators can set a Group Policy to disable the Do Not Send a Response option in Outlook 2013 or hide the option in Outlook 2016, Outlook 2019 and Outlook for Office 365 when attendees accept a meeting request. This policy disables the third option in the meeting response dialog box and on the shortcut menu in Outlook 2013. In addition, it also disables the option when you delete a meeting request in Outlook 2013. For Outlook 2016, Outlook 2019 and Outlook for Office 365, the option is hidden.

For Outlook 2016, Outlook 2019 or Outlook for Office 365, you need to install July 3, 2018, update for Outlook 2016 (KB4022230) and continue the following steps to hide the option:

1. Locate and then select the following registry entry:
   HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Options\Calendar
   HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Outlook\Options\Calendar
2. On the Edit menu, point to New, and then select DWORD Value.
3. Enter ForceMtgResponse, and then press the Enter key.
4. In the Details pane, press and hold (or right-click) ForceMtgResponse, and then select Modify.
5. In the Value data box, enter 1, and then select OK.
6. Exit Registry Editor.

For Outlook 2013, you need to install November 10, 2015, update for Outlook 2013 (KB3101488) and continue the following steps to disable the option.

1. Exit all Microsoft Office applications.
2. Start Registry Editor:
   • In Windows 10, go to Start, enter regedit in the Search Windows box, and then select regedit.exe in the search results.
   • In Windows 8 or Windows 8.1, if you're using a mouse, move it to the upper-right corner, go to Search, enter regedit in the search text box, and then select regedit.exe in the search results.
   • In Windows 7, go to Start, enter regedit in the Search programs and files text box, and then select regedit.exe in the search results.
3. Locate and then select the following registry entry:
   HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\x.0\Outlook\DisabledCmdBarItemsList
   Note The x.0 placeholder represents your Office version (16.0 = Office 2016, Office 2019 or Outlook 2019 and Outlook for Office 365, 15.0 = Office 2013).
4. On the Edit menu, point to New, and then select String Value.
5. Enter TCID1, and then press the Enter key.
6. In the Details pane, press and hold (or right-click) TCID1, and then select Modify.
7. In the Value data box, enter 19987, and then select OK.
8. On the Edit menu, point to New, and then select String Value.
9. Enter TCID2, and then press the Enter key.
10. In the Details pane, press and hold (or right-click) TCID2, and then select Modify.
11. In the Value data box, enter 19995, and then select OK.
12. On the Edit menu, point to New, and then select String Value.
13. Enter TCID3, and then press the Enter key.
14. In the Details pane, press and hold (or right-click) TCID3, and then select Modify.
15. In the Value data box, enter 19991, and then select OK.
16. Exit Registry Editor.