Dropbox can be used to share folders and files with specific clients securely so they can only view and modify their own respective folders and files.
Setting up a new client folder
Log in to the Dropbox website at https://www.dropbox.com/login
On the home page, create a new client folder by selecting the folder icon with a plus.
Enter the client name and enter, the folder will then appear in the list. Then click on the Invite to folder… link
Type in the clients email address and set their permission level, either edit or just view only then click on Share folder.
Your client will receive an email invitation.
As soon as they have clicked View folder they will be able to start uploading and downloading files to this folder.
** Please ensure you invite the correct client to the correct folder to ensure there is no cross client sharing of data. **
Once you have completed this process, these folders will be visible within a newly created O drive where you can drop files into the client specific folders.