I installed Horde as an app on top of a Bitnami Lamp Stack. I do not know the default logins. The documentation says they are the login and password I picked during installation. However, I did not provide any logins or passwords during the installation. During the setup process, I supplied an email address (which is the username, I assume), MySQL password, IMAP/SMTP info, but that's it. I installed it twice to be sure I didn't miss something.
It was installed on a fresh Ubuntu 16.04 64-bit instance.
Any help would be appreciated.