Track the Responses
The Recipient's responses are recorded in the Meeting Request. Let's look at the Tracking.

Before You Begin: Return to the Calendar
Go to Outlook->Home->Calendar.

8. Try It: Find the Meeting Request
The Calendar is opened.
Go to the scheduled date: July 19, 2014.
Click on "New Project"
The Event Details should open.

And Find This, Too: Review the Tracking
The Tracking Tracking shows the Attendees' Responses. In this example there are two responses: Accepted and No response.

Click on either response to review more information. When you are ready, click the X in the upper right corner of this Tracking window to close it and return to the Calendar.

Done and Done.

Outlook->Home->Calendar