I have an Excel spreadsheet that is approximately 1,850 rows long. In it, my organization has a list of which email addresses opened our weekly newsletter. Every week we pull up our statistics and copy and paste the list of email addresses that have opened that week's newsletter into the Excel document, meaning I have a few months' worth of email addresses, many of which repeat often or fairly frequently in the "Email address" column. What I'd like to do is somehow get a list the email addresses sorted by frequency, so I can see how many times each unique email address has opened the newsletter over the last few months. For example, if firstname.lastname@example.org opened the newsletter every week for two months, I would like a list with his email address in one column and the number "8" in another column, signifying the number of opens he's responsible for. Because of the high number of unique email addresses, I can't just do a search for every email address and manually make a note of it. Thanks for any suggestions!