Folder sharing for private group

Question

I would like to share a folder with a group (requires some sort of Invite)
The current structure is:

Group/
        User1/
        User2/
        User3/

All users (that are invited) can view all the folders,
but only User1 can edit the files in folder1
It is crucial that every user can automatically synchronize his local folder with his Group/User folder
Is there some sort of service that allows such a thing ?
Tried to do it in Dropbox but it seems that it doesn't allow such complexity

Answer 1

You can do this on Windows Skydrive. It's a little less elegant in Dropbox.

With Dropbox, you create a folder under your account that you only share with certain people.

With Skydrive, you can create a group and that group can be used as a separate entity.

Just set each folder permission level to read only, and have each user create their own folder under their own profile that they then share with the group.