Before the July 21 release of “Harry Potter and the Deathly Hallows,” Amazon.com sent an email reminding me that I’d pre-ordered the book. The email recommended I upgrade my usual shipping option so the book would arrive on Saturday, July 21, the book’s international release date.
This was an excellent example of a company using e-mail notification based on my purchase data. If my daughter and wife had to wait several days for the book to arrive by the slower shipping option, they would have had to deal with the (continued)