Cancel Editing is supposed to appear for Edit Online too, according to our documentation, but it does not.
1. Install fresh 4.1.7 and set set vti.server.external.host=alfresco-ip
2. From a Windows client, user opens an Office document in the site's document library for Online Editing (clicks button "Edit Online" in document library -> the document is opened in Office)
3. In a separate browser the user (or another with Site Manager role) logs into the same Share and sees that the document is locked. He wants to click "Cancel Editing" but that link does not appear.