Reports - Data
You're analysing your data and you want to be able to see how many people are not opening your campaigns, well look no further, I'll show you:

In Reports, you'll click into the Campaign that you'd like to analyse and you'll be presented with the Summary screen of your campaigns data.
From here I can see that this email was sent to 11 contacts, but who opened the email first. Let's find out!
You will now want to click on the header called 'Data'.

The table in front of you will now give you the data you need. You can toggle between Selected, Sent, Delivered, Unique Opens, Unique Clicks, Unopened, Bounced and Failed.
If you select 'Unique Open', you'll see that the data at the bottom of the screen will then change. I can then click the First Opened header to rearrange the list in order the the first opened time.
