Drupal as a document managemet system?

I've got a requirement to build out an enterprise document managemet system on Drupal. I'm in the early prototype phase, exploring distros and modules (FileDepot module for example).

So I'm eager to expand my research to include white papers, case studies, Drupal libraries and modules for this effort.

Would like a lot of feedback.

Some of the technical requirements:
Accomodate hundreds of users across the country.
Accomodate several hundred document uploads (.docs, pdf).
Stringent content publishing workflow.
Version control for nodes and upload files (.docs, pdf).

More requirements to come, but this is a start.

Thank you
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My friend is using Filedepot (this seems to meet your needs)
This support the filebuilder desktop application
sandshakimiAuthor Commented:
Cool, I was looking at that one. Did you come accoss any case studies?
You can find case Drupal case studies

This one talking about filedepot in comments:

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