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Spaces rendered in a desktop browser will have a Logout button but the Logout menu item (Logout|logout) from a spacewill not appear on mobile devices. Sometime in the future, there will be an iOS app that will handle the authentication on mobile devices. In version 5.1.1, you will have to bookmark two links in your mobile devices: one to the direct frevvo login page which should be used for login/logout to the server from your user account; and second to the space URL to use the forms/flows/tasklist. v5.2 will have the login/logout options available for spaces on mobile devices.