title: Get "latest" version of customer info in Excel
body: <p>I have three spreadsheets of customer data (name, email, physical address). These sheets each have <em>a date column, representing when the contact was last updated</em>. I need to create one spreadsheet from the three using the most recent contact info from each. The "key" (what I'm using to determine two contacts are the same) is email, but the three sheets don't each have the same customers. An email address might exist in one, two, or all three of the sheets. From whichever one(s) it exists, I need the latest version.</p>