For?<p>Our own products and for any programmatic file access, backups etc we use S3.<p>For simple file sharing internally and with clients we use box. We keep a dropbox account active for those clients that already have dropbox setup, but our preference is box. The reason for that is likely more personal preference over capabilities, but we just like box better overall. It works good, never had an issue and to me it feels more business friendly from the start.