pandemic requires lecturers to do online learning, so an alternative is needed to support their learning. Microsoft Office 365 is an application that has many features to make the learning process easier. The purpose of this research is to describe the use of Microsoft Office 365 as an online learning alternative during the Covid-19 pandemic. This research is qualitative with a descriptive approach. The research subjects were students of the Islamic Institute of Muhammadiyah Sinjai, Mathematics Education Study Program. Data were collected by distributing questionnaires and conducting interviews. Lecturers use several Microsoft Office 365 features in learning, namely Teams, Forms, and One Drive. Teams are used to create virtual classes, share materials, develop assignments, quizzes, assessments, and virtual meetings. Form is used to generate attendance lists and questions. One Drive is used to store files and share links. As a conclusion, Office 365 can facilitate lecturers in the learning process because it has many features that can be used as an alternative for online learning during the Covid-19 pandemic.