Amazon uses customers' searching and spending habits to suggest relevant products: When you search, you don't get the newest or cheapest books unless you specifically ask for them, you get the ones that are most popular in terms of reviews and sales. Look for information on Microsoft's support site and, as well as official resources, you will find links to relevant discussions in public newsgroups, so you can see if someone has already found a solution.
These are ideas any company can use on its site or in a service, so you need to make sure you own the user-generated data and metadata that give your service the network effect.
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