When you create a meeting request in a secondary calendar, you'll get a message that responses to the meeting request won't tally because the meeting is not in your default calendar:
This meeting is not in the Calendar folder for this account. Responses to this meeting will not be tallied. Do you want to send anyway?
This is normal Outlook behavior. Responses are only automatically processed when the meeting is in the default calendar. You will be able track the responses on the meeting request by changing the response in the response field on the tracking page.
Tracking Responses
Open the meeting request and switch to the tracking page. right click in the response field and choose the desired response.
The attendance field is also editable on this page, if you need to change invitees between required and optional.
