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This app is a great way to read books purchased from Amazon. It's not as fast as the Kindle apps on other platforms but it is full-featured and provides a reasonable reading experience on Windows 8 tablets.
The Kindle app is particularly useful to read large PDFs for work by simply emailing them to the Windows device using the email address that Amazon provides for that purpose. Visit the Amazon 'Manage Your Kindle' section on its web site if you do not know your email address.
Free in the Microsoft Store
This app was only recently released around the time Windows 8.1 was made available. Its interface is immediately familiar to Facebook users and is a great way to work with the social network.
Viewing shared photos on a Windows tablet is particularly enjoyable.
The app runs fast and fluidly on touch screens. Toast (pop-up) notifications and live tile updates are both supported to help keep users informed of friends' updates.
Free on the Microsoft Store
Windows Mail in Windows 8.1
The Mail app shipped with original Windows 8.0 was particularly bad, especially for Gmail users. That's all changed with Windows 8.1, as it includes a nicely updated Mail app.
The user interface and functionality of the app is good for all Windows 8.1 users, and the Gmail experience is vastly improved, too. It's not as full-featured as a dedicated Gmail app would be, but it's possible to do almost anything that can be done on a dedicated Gmail app.
Included in Windows 8.1