E-learning as educational form has become popular in many educational establishments of the world. The most popular learning platforms seem to be LMS (Learning Management System), Sakai, Moodle and Blackboard. In 2012, St. Petersburg State University chose Blackboard platform. Though other systems are still used from time to time, it is obvious that using Blackboard platform solely is inevitable. Sooner or later other systems will not be supported by the university. This article describes transition of the course “Media audio” from Moodle to Blackboard. Change of the system is caused by Moodle limitations in the volume of loaded files, which is crucial for an audio course, as well as by termination of Moodle support by our university.