We switched to Citrix ShareFile last year and will have our own ""Storage Zone"" this year. We can have (and offer) unlimited users with costs determined by number of admins and amount of storage. Now all of our projects transfer files and share workplans and other documents with this technology.
By the middle of the year a customer's MAS Shared Folder should be accessible by the ShareFile client, browser client or explorer plug in at no additional charge unless they want to administer access at a granular level.