RSVP Botton

Hello,

Is there an .ics attachment instead that you can launch? It sounds like the sender may not be sending the meeting invitation correctly. This is common if they use client app like Outlook Classic, if they have an email address that doesn't support calendar sync, but they send the meeting invitation from the calendar tab anyway, in that case, you will not receive the options to accept or deny. Can you tell me, what's the sender's email domain, for example, is it outlook.com or gmail.com or something else?

Outlook is treating the meeting invite as a normal email when the response buttons are disabled by a registry setting. Enabling the response buttons in the registry restores the proper meeting invite format with RSVP options.

Follow these steps on the laptop where the issue occurs:

1. Close Outlook.
2. Open Registry Editor:
   • In Windows 10/11: Select Start, type regedit, press Enter, and approve any UAC prompt.
3. Navigate to the key (version depends on Outlook):
   • HKEY_CURRENT_USER\Software\Microsoft\Office\x.0\Outlook\Options\Calendar
   • Use 14.0 for Outlook 2010 or 12.0 for Outlook 2007 in place of x.0.
4. In the right pane, locate the DisableResponseButtons DWORD value.
5. Double‑click DisableResponseButtons and set Value data to 0, then select OK.
6. Close Registry Editor.
7. Start Outlook and open a meeting invite; the Accept, Tentative, and Decline options should now appear.

If DisableResponseButtons is only present under the Policies hive HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\x.0\Outlook\Options\Calendar then the setting is controlled by Group Policy and must be changed by the administrator.

Modifying the registry incorrectly can cause serious system problems. Ensure the registry is backed up before making changes and proceed carefully.

References:

• Manager is unable to respond to a meeting invite