I need to figure something else out for a client, they're currently using Dropbox to store 75 gibibytes of customer purchase orders, quotes and engineered drawings. All documents are filed by customer ID and name, then they're accessed and edited by multiple departments in the company, often simultaneously without knowledge from both parties. Dropbox simply creates a new version on a save conflict which is no good.
I've seen Google Docs and I like how it will show you if someone else is viewing or editing the file you're working on, plus merge the changes when it is saved, it also has a nice web interface for accessing the files or a mobile application for your phone.
Sharepoint seems pretty good and it integrates with Office but I think Microsoft is the devil and will avoid it if I can.
My choice would be Amazon WorkDocs but I can't seem to find much information on it. Does it allow for collaborative editing of files? I like the interface for the web version and there are also mobile versions but how nice is the interface? I just can't find video of it anywhere. I signed up for the trial but my account is locked for some reason, I'm waiting on it to get unlocked.
Are there more? What's the best one for a company of 30 employees? We have our own server on site which I manage.