Amazon WorkDocs alternatives

Amazon WorkDocs
Amazon WorkDocs is a fully managed, secure enterprise storage and sharing service with strong administrative controls and feedback capabilities that improve user productivity. Users can comment on files, send them to others for feedback, and upload new versions without having to resort to emailing multiple versions of their files as attachments. Users can take advantage of these capabilities wherever they are, using the device of their choice, including PCs, Macs, and tablets.
Amazon WorkDocs alternatives are:
OneDrive, Google Drive, Box, Dropbox, SharePoint
Here are the latest news about Amazon WorkDocs:

2014 Amazon adds new syncing feature to enterprise cloud storage Zocalo

Amazon’s Zocalo work-collaboration tool that competes with services like Dropbox and Box gets the new feature that allows to sync files to your computer or mobile device through a shared folder. Users can set up per-project folders and share them with members of the project team on an as-needed basis. After setting up a shared folder, team members can then access those documents and each time they edit and save the file, Zocalo records those changes. The new syncing feature is optional for users and, if you want it, you’ll have to activate it in the preferences section of your Zocalo client.

2014 Amazon launched enterprise file-sharing service Zocalo

Amazon targets Microsoft, Google and Box with their new enterprise file-sharing service Amazon Zocalo. It's based on Amazon Web Services and provides fully managed, secure document storage and sharing service designed specifically for the needs of the enterprise. Zocalo has centralized user management, and can also link to an existing Active Directory. This is a big deal, since one of the challenges with cloud-based document solutions such as Dropbox is the fact that permissions structures aren't granular enough to work in environments that have strict IT policies. Amazon also says that all documents are transmitted in encrypted form. Zocalo has client syncing apps for Windows and Mac for folder sync. You can also use Zocalo apps for iPad, Kindle Fire and Android tablets. The price is $5 per user per month for 200GB of storage.