Data Hosting/Storage

I'm not sure this is in the right forum, but I think I'm close. :)

I am helping someone edit a book. I would like to put it on a website that enables both of us to edit it. This site would have to be password protected and must support MS Word. I do not want to have to reformat anything or any pages. I also need to be able to upload and edit each chapter individually.

Does anyone know a good data hosting site that would support my needs?

I will be very thankful for any help.

Would this fit the bill: FREE Document File Hosting – YouTube for eBooks | Raymond.CC Blog

Thanks for the quick repsonse WHS! I'll have to check it out. :)