Difference between updated and timestamp in list
I want to know when users opened an email that they received I've created a smart list of users who have opened the particular email, but it's unclear if there's an "open timestamp." In the default report view, I see a column titled "Updated" but cannot find a definition for what that means -- is that first or most recent time a user has opened the email? There's also a hidden field called Reporting Timestamp, but it's unclear what info that it's displaying for some of the users.