It is possible to import users from Office 365 or using a CSV from, with or without password and from Office 365.

First navigate to the "Settings".

Navigate to "User management". 

To import users from Office 365, click “Import”.

After clicking “From Office 365” you will see a list of your Office 365 users. Select which users you want to import and click “Import”;

The users are now successfully imported, click “User management” to see the active users. By default, users will receive a registration email.