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Full-blown file manager
The Windows File Manager has long been a fixture on desktops because it is as good a file handler as that on any platform. The ability to perform any file function is a powerful feature on a tablet.
There are third party file managers for the iPad and Android tablets, but few of those are as powerful as the Windows manager. Windows 8 includes it in the box so tablet owners have it at their beck and call.
Security is important, especially for mobile devices that can be lost or stolen. A good way to keep data private no matter what is to encrypt everything so it can't be viewed without a security key.
Enter Bitlocker, an encryption method that comes with Windows 8 Pro and Windows 8 Enterprise edition. You can easily encrypt entire drives with Bitlocker to make sure only you can access the data. This can render a lost or stolen tablet useless for the finder/thief while protecting your private data.
Tablets are the perfect form for supporting handwritten input, and Windows 8 is easily the best platform for such support. Pen input has been available in Windows for over a decade, and Windows 8 leverages it fully.
Certain apps like OneNote and Windows Journal work particularly well with the pen but it's not limited to those. The onscreen keyboard used in Windows 8 for touch entry can be switched to handwritten entry on tablets with a pen. The automatic text recognition can understand even poor handwriting for entry as text.