We were accessing the shared folders over the Web App. We granted sharing to an email address through the invite (recipents recieved the notification via email and were able to access the folder) and then later we removed their email addresses (expecting they would not longer have access) and were still able to see the folders and the contents. We were very suprised as we thought if we removed them they won't be able to have access to the folders or contents (this was still the case even if they logged out and back in). We tried this several times with the same results.