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Compatibility: iPhone, iPod touch and iPad. Requires iOS 5.0 or later.
While there are many file storage services on the market -- Microsoft's Skydrive and Dropbox to name a few -- Box is often touted as the best alternative for business users. A free account gives you 10GB to play with, and you can also annotate, e-sign and share documents through the Box app ecosystem.
Files can be secured with encryption, passwords and automatic logging-out when the application is closed.
Via: Apple App Store